Merge branch 'uaccess.net' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Al Viro says:

====================
uaccess-related stuff in net/*

Assorted uaccess-related work in net/*.  First, there's
getting rid of compat_alloc_user_space() mess in MCAST_...
[gs]etsockopt() - no need to play with copying to/from temporary
object on userland stack, etc., when ->compat_[sg]etsockopt()
instances in question can easly do everything without that.
That's the first 13 patches.  Then there's a trivial bit in
net/batman-adv (completely unrelated to everything else) and
finally getting the atm compat ioctls into simpler shape.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/igmp.h

@@ -123,7 +123,7 @@ extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
 extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
 		struct ip_msfilter __user *optval, int __user *optlen);
 extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
-		struct group_filter __user *optval, int __user *optlen);
+			struct sockaddr_storage __user *p);
 extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt,
 			  int dif, int sdif);
 extern void ip_mc_init_dev(struct in_device *);

include/net/compat.h

@@ -67,11 +67,28 @@ int put_cmsg_compat(struct msghdr*, int, int, int, void *);
 int cmsghdr_from_user_compat_to_kern(struct msghdr *, struct sock *,
 				     unsigned char *, int);
 
-int compat_mc_setsockopt(struct sock *, int, int, char __user *, unsigned int,
-			 int (*)(struct sock *, int, int, char __user *,
-				 unsigned int));
-int compat_mc_getsockopt(struct sock *, int, int, char __user *, int __user *,
-			 int (*)(struct sock *, int, int, char __user *,
-				 int __user *));
+struct compat_group_req {
+	__u32				 gr_interface;
+	struct __kernel_sockaddr_storage gr_group
+		__aligned(4);
+} __packed;
+
+struct compat_group_source_req {
+	__u32				 gsr_interface;
+	struct __kernel_sockaddr_storage gsr_group
+		__aligned(4);
+	struct __kernel_sockaddr_storage gsr_source
+		__aligned(4);
+} __packed;
+
+struct compat_group_filter {
+	__u32				 gf_interface;
+	struct __kernel_sockaddr_storage gf_group
+		__aligned(4);
+	__u32				 gf_fmode;
+	__u32				 gf_numsrc;
+	struct __kernel_sockaddr_storage gf_slist[1]
+		__aligned(4);
+} __packed;
 
 #endif /* NET_COMPAT_H */

include/net/ipv6.h

@@ -1136,9 +1136,10 @@ struct group_filter;
 
 int ip6_mc_source(int add, int omode, struct sock *sk,
 		  struct group_source_req *pgsr);
-int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
+int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
+		  struct sockaddr_storage *list);
 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
-		  struct group_filter __user *optval, int __user *optlen);
+		  struct sockaddr_storage __user *p);
 
 #ifdef CONFIG_PROC_FS
 int ac6_proc_init(struct net *net);

net/atm/ioctl.c

@@ -56,6 +56,8 @@ static int do_vcc_ioctl(struct socket *sock, unsigned int cmd,
 	int error;
 	struct list_head *pos;
 	void __user *argp = (void __user *)arg;
+	void __user *buf;
+	int __user *len;
 
 	vcc = ATM_SD(sock);
 	switch (cmd) {
@@ -162,7 +164,49 @@ static int do_vcc_ioctl(struct socket *sock, unsigned int cmd,
 	if (error != -ENOIOCTLCMD)
 		goto done;
 
-	error = atm_dev_ioctl(cmd, argp, compat);
+	if (cmd == ATM_GETNAMES) {
+		if (IS_ENABLED(CONFIG_COMPAT) && compat) {
+#ifdef CONFIG_COMPAT
+			struct compat_atm_iobuf __user *ciobuf = argp;
+			compat_uptr_t cbuf;
+			len = &ciobuf->length;
+			if (get_user(cbuf, &ciobuf->buffer))
+				return -EFAULT;
+			buf = compat_ptr(cbuf);
+#endif
+		} else {
+			struct atm_iobuf __user *iobuf = argp;
+			len = &iobuf->length;
+			if (get_user(buf, &iobuf->buffer))
+				return -EFAULT;
+		}
+		error = atm_getnames(buf, len);
+	} else {
+		int number;
+
+		if (IS_ENABLED(CONFIG_COMPAT) && compat) {
+#ifdef CONFIG_COMPAT
+			struct compat_atmif_sioc __user *csioc = argp;
+			compat_uptr_t carg;
+
+			len = &csioc->length;
+			if (get_user(carg, &csioc->arg))
+				return -EFAULT;
+			buf = compat_ptr(carg);
+			if (get_user(number, &csioc->number))
+				return -EFAULT;
+#endif
+		} else {
+			struct atmif_sioc __user *sioc = argp;
+
+			len = &sioc->length;
+			if (get_user(buf, &sioc->arg))
+				return -EFAULT;
+			if (get_user(number, &sioc->number))
+				return -EFAULT;
+		}
+		error = atm_dev_ioctl(cmd, buf, len, number, compat);
+	}
 
 done:
 	return error;
@@ -230,61 +274,25 @@ static struct {
 static int do_atm_iobuf(struct socket *sock, unsigned int cmd,
 			unsigned long arg)
 {
-	struct atm_iobuf __user *iobuf;
-	struct compat_atm_iobuf __user *iobuf32;
+	struct compat_atm_iobuf __user *iobuf32 = compat_ptr(arg);
 	u32 data;
-	void __user *datap;
-	int len, err;
-
-	iobuf = compat_alloc_user_space(sizeof(*iobuf));
-	iobuf32 = compat_ptr(arg);
 
-	if (get_user(len, &iobuf32->length) ||
-	    get_user(data, &iobuf32->buffer))
+	if (get_user(data, &iobuf32->buffer))
 		return -EFAULT;
-	datap = compat_ptr(data);
-	if (put_user(len, &iobuf->length) ||
-	    put_user(datap, &iobuf->buffer))
-		return -EFAULT;
-
-	err = do_vcc_ioctl(sock, cmd, (unsigned long) iobuf, 0);
 
-	if (!err) {
-		if (copy_in_user(&iobuf32->length, &iobuf->length,
-				 sizeof(int)))
-			err = -EFAULT;
-	}
-
-	return err;
+	return atm_getnames(&iobuf32->length, compat_ptr(data));
 }
 
 static int do_atmif_sioc(struct socket *sock, unsigned int cmd,
 			 unsigned long arg)
 {
-	struct atmif_sioc __user *sioc;
-	struct compat_atmif_sioc __user *sioc32;
+	struct compat_atmif_sioc __user *sioc32 = compat_ptr(arg);
+	int number;
 	u32 data;
-	void __user *datap;
-	int err;
-
-	sioc = compat_alloc_user_space(sizeof(*sioc));
-	sioc32 = compat_ptr(arg);
 
-	if (copy_in_user(&sioc->number, &sioc32->number, 2 * sizeof(int)) ||
-	    get_user(data, &sioc32->arg))
+	if (get_user(data, &sioc32->arg) || get_user(number, &sioc32->number))
 		return -EFAULT;
-	datap = compat_ptr(data);
-	if (put_user(datap, &sioc->arg))
-		return -EFAULT;
-
-	err = do_vcc_ioctl(sock, cmd, (unsigned long) sioc, 0);
-
-	if (!err) {
-		if (copy_in_user(&sioc32->length, &sioc->length,
-				 sizeof(int)))
-			err = -EFAULT;
-	}
-	return err;
+	return atm_dev_ioctl(cmd, compat_ptr(data), &sioc32->length, number, 0);
 }
 
 static int do_atm_ioctl(struct socket *sock, unsigned int cmd32,

net/atm/resources.c

@@ -193,88 +193,48 @@ static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg,
 	return error ? -EFAULT : 0;
 }
 
-int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat)
+int atm_getnames(void __user *buf, int __user *iobuf_len)
 {
-	void __user *buf;
-	int error, len, number, size = 0;
+	int error, len, size = 0;
 	struct atm_dev *dev;
 	struct list_head *p;
 	int *tmp_buf, *tmp_p;
-	int __user *sioc_len;
-	int __user *iobuf_len;
 
-	switch (cmd) {
-	case ATM_GETNAMES:
-		if (IS_ENABLED(CONFIG_COMPAT) && compat) {
-#ifdef CONFIG_COMPAT
-			struct compat_atm_iobuf __user *ciobuf = arg;
-			compat_uptr_t cbuf;
-			iobuf_len = &ciobuf->length;
-			if (get_user(cbuf, &ciobuf->buffer))
-				return -EFAULT;
-			buf = compat_ptr(cbuf);
-#endif
-		} else {
-			struct atm_iobuf __user *iobuf = arg;
-			iobuf_len = &iobuf->length;
-			if (get_user(buf, &iobuf->buffer))
-				return -EFAULT;
-		}
-		if (get_user(len, iobuf_len))
-			return -EFAULT;
-		mutex_lock(&atm_dev_mutex);
-		list_for_each(p, &atm_devs)
-			size += sizeof(int);
-		if (size > len) {
-			mutex_unlock(&atm_dev_mutex);
-			return -E2BIG;
-		}
-		tmp_buf = kmalloc(size, GFP_ATOMIC);
-		if (!tmp_buf) {
-			mutex_unlock(&atm_dev_mutex);
-			return -ENOMEM;
-		}
-		tmp_p = tmp_buf;
-		list_for_each(p, &atm_devs) {
-			dev = list_entry(p, struct atm_dev, dev_list);
-			*tmp_p++ = dev->number;
-		}
+	if (get_user(len, iobuf_len))
+		return -EFAULT;
+	mutex_lock(&atm_dev_mutex);
+	list_for_each(p, &atm_devs)
+		size += sizeof(int);
+	if (size > len) {
 		mutex_unlock(&atm_dev_mutex);
-		error = ((copy_to_user(buf, tmp_buf, size)) ||
-			 put_user(size, iobuf_len))
-			? -EFAULT : 0;
-		kfree(tmp_buf);
-		return error;
-	default:
-		break;
+		return -E2BIG;
 	}
-
-	if (IS_ENABLED(CONFIG_COMPAT) && compat) {
-#ifdef CONFIG_COMPAT
-		struct compat_atmif_sioc __user *csioc = arg;
-		compat_uptr_t carg;
-
-		sioc_len = &csioc->length;
-		if (get_user(carg, &csioc->arg))
-			return -EFAULT;
-		buf = compat_ptr(carg);
-
-		if (get_user(len, &csioc->length))
-			return -EFAULT;
-		if (get_user(number, &csioc->number))
-			return -EFAULT;
-#endif
-	} else {
-		struct atmif_sioc __user *sioc = arg;
-
-		sioc_len = &sioc->length;
-		if (get_user(buf, &sioc->arg))
-			return -EFAULT;
-		if (get_user(len, &sioc->length))
-			return -EFAULT;
-		if (get_user(number, &sioc->number))
-			return -EFAULT;
+	tmp_buf = kmalloc(size, GFP_ATOMIC);
+	if (!tmp_buf) {
+		mutex_unlock(&atm_dev_mutex);
+		return -ENOMEM;
+	}
+	tmp_p = tmp_buf;
+	list_for_each(p, &atm_devs) {
+		dev = list_entry(p, struct atm_dev, dev_list);
+		*tmp_p++ = dev->number;
 	}
+	mutex_unlock(&atm_dev_mutex);
+	error = ((copy_to_user(buf, tmp_buf, size)) ||
+		 put_user(size, iobuf_len))
+		? -EFAULT : 0;
+	kfree(tmp_buf);
+	return error;
+}
+
+int atm_dev_ioctl(unsigned int cmd, void __user *buf, int __user *sioc_len,
+		  int number, int compat)
+{
+	int error, len, size = 0;
+	struct atm_dev *dev;
+
+	if (get_user(len, sioc_len))
+		return -EFAULT;
 
 	dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d",
 				      number);

net/atm/resources.h

@@ -14,8 +14,9 @@
 extern struct list_head atm_devs;
 extern struct mutex atm_dev_mutex;
 
-int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat);
-
+int atm_getnames(void __user *buf, int __user *iobuf_len);
+int atm_dev_ioctl(unsigned int cmd, void __user *buf, int __user *sioc_len,
+		  int number, int compat);
 
 #ifdef CONFIG_PROC_FS
 

net/batman-adv/icmp_socket.c

@@ -135,9 +135,6 @@ static ssize_t batadv_socket_read(struct file *file, char __user *buf,
 	if (!buf || count < sizeof(struct batadv_icmp_packet))
 		return -EINVAL;
 
-	if (!access_ok(buf, count))
-		return -EFAULT;
-
 	error = wait_event_interruptible(socket_client->queue_wait,
 					 socket_client->queue_len);
 

net/compat.c

@@ -448,200 +448,6 @@ COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
 	return __compat_sys_getsockopt(fd, level, optname, optval, optlen);
 }
 
-struct compat_group_req {
-	__u32				 gr_interface;
-	struct __kernel_sockaddr_storage gr_group
-		__aligned(4);
-} __packed;
-
-struct compat_group_source_req {
-	__u32				 gsr_interface;
-	struct __kernel_sockaddr_storage gsr_group
-		__aligned(4);
-	struct __kernel_sockaddr_storage gsr_source
-		__aligned(4);
-} __packed;
-
-struct compat_group_filter {
-	__u32				 gf_interface;
-	struct __kernel_sockaddr_storage gf_group
-		__aligned(4);
-	__u32				 gf_fmode;
-	__u32				 gf_numsrc;
-	struct __kernel_sockaddr_storage gf_slist[1]
-		__aligned(4);
-} __packed;
-
-#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
-			sizeof(struct __kernel_sockaddr_storage))
-
-
-int compat_mc_setsockopt(struct sock *sock, int level, int optname,
-	char __user *optval, unsigned int optlen,
-	int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
-{
-	char __user	*koptval = optval;
-	int		koptlen = optlen;
-
-	switch (optname) {
-	case MCAST_JOIN_GROUP:
-	case MCAST_LEAVE_GROUP:
-	{
-		struct compat_group_req __user *gr32 = (void __user *)optval;
-		struct group_req __user *kgr =
-			compat_alloc_user_space(sizeof(struct group_req));
-		u32 interface;
-
-		if (!access_ok(gr32, sizeof(*gr32)) ||
-		    !access_ok(kgr, sizeof(struct group_req)) ||
-		    __get_user(interface, &gr32->gr_interface) ||
-		    __put_user(interface, &kgr->gr_interface) ||
-		    copy_in_user(&kgr->gr_group, &gr32->gr_group,
-				sizeof(kgr->gr_group)))
-			return -EFAULT;
-		koptval = (char __user *)kgr;
-		koptlen = sizeof(struct group_req);
-		break;
-	}
-	case MCAST_JOIN_SOURCE_GROUP:
-	case MCAST_LEAVE_SOURCE_GROUP:
-	case MCAST_BLOCK_SOURCE:
-	case MCAST_UNBLOCK_SOURCE:
-	{
-		struct compat_group_source_req __user *gsr32 = (void __user *)optval;
-		struct group_source_req __user *kgsr = compat_alloc_user_space(
-			sizeof(struct group_source_req));
-		u32 interface;
-
-		if (!access_ok(gsr32, sizeof(*gsr32)) ||
-		    !access_ok(kgsr,
-			sizeof(struct group_source_req)) ||
-		    __get_user(interface, &gsr32->gsr_interface) ||
-		    __put_user(interface, &kgsr->gsr_interface) ||
-		    copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
-				sizeof(kgsr->gsr_group)) ||
-		    copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
-				sizeof(kgsr->gsr_source)))
-			return -EFAULT;
-		koptval = (char __user *)kgsr;
-		koptlen = sizeof(struct group_source_req);
-		break;
-	}
-	case MCAST_MSFILTER:
-	{
-		struct compat_group_filter __user *gf32 = (void __user *)optval;
-		struct group_filter __user *kgf;
-		u32 interface, fmode, numsrc;
-
-		if (!access_ok(gf32, __COMPAT_GF0_SIZE) ||
-		    __get_user(interface, &gf32->gf_interface) ||
-		    __get_user(fmode, &gf32->gf_fmode) ||
-		    __get_user(numsrc, &gf32->gf_numsrc))
-			return -EFAULT;
-		koptlen = optlen + sizeof(struct group_filter) -
-				sizeof(struct compat_group_filter);
-		if (koptlen < GROUP_FILTER_SIZE(numsrc))
-			return -EINVAL;
-		kgf = compat_alloc_user_space(koptlen);
-		if (!access_ok(kgf, koptlen) ||
-		    __put_user(interface, &kgf->gf_interface) ||
-		    __put_user(fmode, &kgf->gf_fmode) ||
-		    __put_user(numsrc, &kgf->gf_numsrc) ||
-		    copy_in_user(&kgf->gf_group, &gf32->gf_group,
-				sizeof(kgf->gf_group)) ||
-		    (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
-				numsrc * sizeof(kgf->gf_slist[0]))))
-			return -EFAULT;
-		koptval = (char __user *)kgf;
-		break;
-	}
-
-	default:
-		break;
-	}
-	return setsockopt(sock, level, optname, koptval, koptlen);
-}
-EXPORT_SYMBOL(compat_mc_setsockopt);
-
-int compat_mc_getsockopt(struct sock *sock, int level, int optname,
-	char __user *optval, int __user *optlen,
-	int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
-{
-	struct compat_group_filter __user *gf32 = (void __user *)optval;
-	struct group_filter __user *kgf;
-	int __user	*koptlen;
-	u32 interface, fmode, numsrc;
-	int klen, ulen, err;
-
-	if (optname != MCAST_MSFILTER)
-		return getsockopt(sock, level, optname, optval, optlen);
-
-	koptlen = compat_alloc_user_space(sizeof(*koptlen));
-	if (!access_ok(optlen, sizeof(*optlen)) ||
-	    __get_user(ulen, optlen))
-		return -EFAULT;
-
-	/* adjust len for pad */
-	klen = ulen + sizeof(*kgf) - sizeof(*gf32);
-
-	if (klen < GROUP_FILTER_SIZE(0))
-		return -EINVAL;
-
-	if (!access_ok(koptlen, sizeof(*koptlen)) ||
-	    __put_user(klen, koptlen))
-		return -EFAULT;
-
-	/* have to allow space for previous compat_alloc_user_space, too */
-	kgf = compat_alloc_user_space(klen+sizeof(*optlen));
-
-	if (!access_ok(gf32, __COMPAT_GF0_SIZE) ||
-	    __get_user(interface, &gf32->gf_interface) ||
-	    __get_user(fmode, &gf32->gf_fmode) ||
-	    __get_user(numsrc, &gf32->gf_numsrc) ||
-	    __put_user(interface, &kgf->gf_interface) ||
-	    __put_user(fmode, &kgf->gf_fmode) ||
-	    __put_user(numsrc, &kgf->gf_numsrc) ||
-	    copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
-		return -EFAULT;
-
-	err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
-	if (err)
-		return err;
-
-	if (!access_ok(koptlen, sizeof(*koptlen)) ||
-	    __get_user(klen, koptlen))
-		return -EFAULT;
-
-	ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
-
-	if (!access_ok(optlen, sizeof(*optlen)) ||
-	    __put_user(ulen, optlen))
-		return -EFAULT;
-
-	if (!access_ok(kgf, klen) ||
-	    !access_ok(gf32, ulen) ||
-	    __get_user(interface, &kgf->gf_interface) ||
-	    __get_user(fmode, &kgf->gf_fmode) ||
-	    __get_user(numsrc, &kgf->gf_numsrc) ||
-	    __put_user(interface, &gf32->gf_interface) ||
-	    __put_user(fmode, &gf32->gf_fmode) ||
-	    __put_user(numsrc, &gf32->gf_numsrc))
-		return -EFAULT;
-	if (numsrc) {
-		int copylen;
-
-		klen -= GROUP_FILTER_SIZE(0);
-		copylen = numsrc * sizeof(gf32->gf_slist[0]);
-		if (copylen > klen)
-			copylen = klen;
-		if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
-			return -EFAULT;
-	}
-	return err;
-}
-EXPORT_SYMBOL(compat_mc_getsockopt);
-
-
 /* Argument list sizes for compat_sys_socketcall */
 #define AL(x) ((x) * sizeof(u32))
 static unsigned char nas[21] = {

net/ipv4/igmp.c

@@ -2565,9 +2565,9 @@ int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
 }
 
 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
-	struct group_filter __user *optval, int __user *optlen)
+	struct sockaddr_storage __user *p)
 {
-	int err, i, count, copycount;
+	int i, count, copycount;
 	struct sockaddr_in *psin;
 	__be32 addr;
 	struct ip_mc_socklist *pmc;
@@ -2583,37 +2583,29 @@ int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
 	if (!ipv4_is_multicast(addr))
 		return -EINVAL;
 
-	err = -EADDRNOTAVAIL;
-
 	for_each_pmc_rtnl(inet, pmc) {
 		if (pmc->multi.imr_multiaddr.s_addr == addr &&
 		    pmc->multi.imr_ifindex == gsf->gf_interface)
 			break;
 	}
 	if (!pmc)		/* must have a prior join */
-		goto done;
+		return -EADDRNOTAVAIL;
 	gsf->gf_fmode = pmc->sfmode;
 	psl = rtnl_dereference(pmc->sflist);
 	count = psl ? psl->sl_count : 0;
 	copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 	gsf->gf_numsrc = count;
-	if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
-	    copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
-		return -EFAULT;
-	}
-	for (i = 0; i < copycount; i++) {
+	for (i = 0; i < copycount; i++, p++) {
 		struct sockaddr_storage ss;
 
 		psin = (struct sockaddr_in *)&ss;
 		memset(&ss, 0, sizeof(ss));
 		psin->sin_family = AF_INET;
 		psin->sin_addr.s_addr = psl->sl_addr[i];
-		if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
+		if (copy_to_user(p, &ss, sizeof(ss)))
 			return -EFAULT;
 	}
 	return 0;
-done:
-	return err;
 }
 
 /*

net/ipv4/ip_sockglue.c

@@ -587,6 +587,86 @@ static bool setsockopt_needs_rtnl(int optname)
 	return false;
 }
 
+static int set_mcast_msfilter(struct sock *sk, int ifindex,
+			      int numsrc, int fmode,
+			      struct sockaddr_storage *group,
+			      struct sockaddr_storage *list)
+{
+	int msize = IP_MSFILTER_SIZE(numsrc);
+	struct ip_msfilter *msf;
+	struct sockaddr_in *psin;
+	int err, i;
+
+	msf = kmalloc(msize, GFP_KERNEL);
+	if (!msf)
+		return -ENOBUFS;
+
+	psin = (struct sockaddr_in *)group;
+	if (psin->sin_family != AF_INET)
+		goto Eaddrnotavail;
+	msf->imsf_multiaddr = psin->sin_addr.s_addr;
+	msf->imsf_interface = 0;
+	msf->imsf_fmode = fmode;
+	msf->imsf_numsrc = numsrc;
+	for (i = 0; i < numsrc; ++i) {
+		psin = (struct sockaddr_in *)&list[i];
+
+		if (psin->sin_family != AF_INET)
+			goto Eaddrnotavail;
+		msf->imsf_slist[i] = psin->sin_addr.s_addr;
+	}
+	err = ip_mc_msfilter(sk, msf, ifindex);
+	kfree(msf);
+	return err;
+
+Eaddrnotavail:
+	kfree(msf);
+	return -EADDRNOTAVAIL;
+}
+
+static int do_mcast_group_source(struct sock *sk, int optname,
+				 struct group_source_req *greqs)
+{
+	struct ip_mreq_source mreqs;
+	struct sockaddr_in *psin;
+	int omode, add, err;
+
+	if (greqs->gsr_group.ss_family != AF_INET ||
+	    greqs->gsr_source.ss_family != AF_INET)
+		return -EADDRNOTAVAIL;
+
+	psin = (struct sockaddr_in *)&greqs->gsr_group;
+	mreqs.imr_multiaddr = psin->sin_addr.s_addr;
+	psin = (struct sockaddr_in *)&greqs->gsr_source;
+	mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
+	mreqs.imr_interface = 0; /* use index for mc_source */
+
+	if (optname == MCAST_BLOCK_SOURCE) {
+		omode = MCAST_EXCLUDE;
+		add = 1;
+	} else if (optname == MCAST_UNBLOCK_SOURCE) {
+		omode = MCAST_EXCLUDE;
+		add = 0;
+	} else if (optname == MCAST_JOIN_SOURCE_GROUP) {
+		struct ip_mreqn mreq;
+
+		psin = (struct sockaddr_in *)&greqs->gsr_group;
+		mreq.imr_multiaddr = psin->sin_addr;
+		mreq.imr_address.s_addr = 0;
+		mreq.imr_ifindex = greqs->gsr_interface;
+		err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE);
+		if (err && err != -EADDRINUSE)
+			return err;
+		greqs->gsr_interface = mreq.imr_ifindex;
+		omode = MCAST_INCLUDE;
+		add = 1;
+	} else /* MCAST_LEAVE_SOURCE_GROUP */ {
+		omode = MCAST_INCLUDE;
+		add = 0;
+	}
+	return ip_mc_source(add, omode, sk, &mreqs, greqs->gsr_interface);
+}
+
 static int do_ip_setsockopt(struct sock *sk, int level,
 			    int optname, char __user *optval, unsigned int optlen)
 {
@@ -1029,9 +1109,6 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 	case MCAST_UNBLOCK_SOURCE:
 	{
 		struct group_source_req greqs;
-		struct ip_mreq_source mreqs;
-		struct sockaddr_in *psin;
-		int omode, add;
 
 		if (optlen != sizeof(struct group_source_req))
 			goto e_inval;
@@ -1039,50 +1116,12 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 			err = -EFAULT;
 			break;
 		}
-		if (greqs.gsr_group.ss_family != AF_INET ||
-		    greqs.gsr_source.ss_family != AF_INET) {
-			err = -EADDRNOTAVAIL;
-			break;
-		}
-		psin = (struct sockaddr_in *)&greqs.gsr_group;
-		mreqs.imr_multiaddr = psin->sin_addr.s_addr;
-		psin = (struct sockaddr_in *)&greqs.gsr_source;
-		mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
-		mreqs.imr_interface = 0; /* use index for mc_source */
-
-		if (optname == MCAST_BLOCK_SOURCE) {
-			omode = MCAST_EXCLUDE;
-			add = 1;
-		} else if (optname == MCAST_UNBLOCK_SOURCE) {
-			omode = MCAST_EXCLUDE;
-			add = 0;
-		} else if (optname == MCAST_JOIN_SOURCE_GROUP) {
-			struct ip_mreqn mreq;
-
-			psin = (struct sockaddr_in *)&greqs.gsr_group;
-			mreq.imr_multiaddr = psin->sin_addr;
-			mreq.imr_address.s_addr = 0;
-			mreq.imr_ifindex = greqs.gsr_interface;
-			err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE);
-			if (err && err != -EADDRINUSE)
-				break;
-			greqs.gsr_interface = mreq.imr_ifindex;
-			omode = MCAST_INCLUDE;
-			add = 1;
-		} else /* MCAST_LEAVE_SOURCE_GROUP */ {
-			omode = MCAST_INCLUDE;
-			add = 0;
-		}
-		err = ip_mc_source(add, omode, sk, &mreqs,
-				   greqs.gsr_interface);
+		err = do_mcast_group_source(sk, optname, &greqs);
 		break;
 	}
 	case MCAST_MSFILTER:
 	{
-		struct sockaddr_in *psin;
-		struct ip_msfilter *msf = NULL;
 		struct group_filter *gsf = NULL;
-		int msize, i, ifindex;
 
 		if (optlen < GROUP_FILTER_SIZE(0))
 			goto e_inval;
@@ -1095,7 +1134,6 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 			err = PTR_ERR(gsf);
 			break;
 		}
-
 		/* numsrc >= (4G-140)/128 overflow in 32 bits */
 		if (gsf->gf_numsrc >= 0x1ffffff ||
 		    gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
@@ -1106,36 +1144,10 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 			err = -EINVAL;
 			goto mc_msf_out;
 		}
-		msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
-		msf = kmalloc(msize, GFP_KERNEL);
-		if (!msf) {
-			err = -ENOBUFS;
-			goto mc_msf_out;
-		}
-		ifindex = gsf->gf_interface;
-		psin = (struct sockaddr_in *)&gsf->gf_group;
-		if (psin->sin_family != AF_INET) {
-			err = -EADDRNOTAVAIL;
-			goto mc_msf_out;
-		}
-		msf->imsf_multiaddr = psin->sin_addr.s_addr;
-		msf->imsf_interface = 0;
-		msf->imsf_fmode = gsf->gf_fmode;
-		msf->imsf_numsrc = gsf->gf_numsrc;
-		err = -EADDRNOTAVAIL;
-		for (i = 0; i < gsf->gf_numsrc; ++i) {
-			psin = (struct sockaddr_in *)&gsf->gf_slist[i];
-
-			if (psin->sin_family != AF_INET)
-				goto mc_msf_out;
-			msf->imsf_slist[i] = psin->sin_addr.s_addr;
-		}
-		kfree(gsf);
-		gsf = NULL;
-
-		err = ip_mc_msfilter(sk, msf, ifindex);
+		err = set_mcast_msfilter(sk, gsf->gf_interface,
+					 gsf->gf_numsrc, gsf->gf_fmode,
+					 &gsf->gf_group, gsf->gf_slist);
 mc_msf_out:
-		kfree(msf);
 		kfree(gsf);
 		break;
 	}
@@ -1272,9 +1284,113 @@ int compat_ip_setsockopt(struct sock *sk, int level, int optname,
 	if (level != SOL_IP)
 		return -ENOPROTOOPT;
 
-	if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
-		return compat_mc_setsockopt(sk, level, optname, optval, optlen,
-			ip_setsockopt);
+	switch (optname) {
+	case MCAST_JOIN_GROUP:
+	case MCAST_LEAVE_GROUP:
+	{
+		struct compat_group_req __user *gr32 = (void __user *)optval;
+		struct group_req greq;
+		struct sockaddr_in *psin = (struct sockaddr_in *)&greq.gr_group;
+		struct ip_mreqn mreq;
+
+		if (optlen < sizeof(struct compat_group_req))
+			return -EINVAL;
+
+		if (get_user(greq.gr_interface, &gr32->gr_interface) ||
+		    copy_from_user(&greq.gr_group, &gr32->gr_group,
+				sizeof(greq.gr_group)))
+			return -EFAULT;
+
+		if (psin->sin_family != AF_INET)
+			return -EINVAL;
+
+		memset(&mreq, 0, sizeof(mreq));
+		mreq.imr_multiaddr = psin->sin_addr;
+		mreq.imr_ifindex = greq.gr_interface;
+
+		rtnl_lock();
+		lock_sock(sk);
+		if (optname == MCAST_JOIN_GROUP)
+			err = ip_mc_join_group(sk, &mreq);
+		else
+			err = ip_mc_leave_group(sk, &mreq);
+		release_sock(sk);
+		rtnl_unlock();
+		return err;
+	}
+	case MCAST_JOIN_SOURCE_GROUP:
+	case MCAST_LEAVE_SOURCE_GROUP:
+	case MCAST_BLOCK_SOURCE:
+	case MCAST_UNBLOCK_SOURCE:
+	{
+		struct compat_group_source_req __user *gsr32 = (void __user *)optval;
+		struct group_source_req greqs;
+
+		if (optlen != sizeof(struct compat_group_source_req))
+			return -EINVAL;
+
+		if (get_user(greqs.gsr_interface, &gsr32->gsr_interface) ||
+		    copy_from_user(&greqs.gsr_group, &gsr32->gsr_group,
+				sizeof(greqs.gsr_group)) ||
+		    copy_from_user(&greqs.gsr_source, &gsr32->gsr_source,
+				sizeof(greqs.gsr_source)))
+			return -EFAULT;
+
+		rtnl_lock();
+		lock_sock(sk);
+		err = do_mcast_group_source(sk, optname, &greqs);
+		release_sock(sk);
+		rtnl_unlock();
+		return err;
+	}
+	case MCAST_MSFILTER:
+	{
+		const int size0 = offsetof(struct compat_group_filter, gf_slist);
+		struct compat_group_filter *gf32;
+		void *p;
+		int n;
+
+		if (optlen < size0)
+			return -EINVAL;
+		if (optlen > sysctl_optmem_max - 4)
+			return -ENOBUFS;
+
+		p = kmalloc(optlen + 4, GFP_KERNEL);
+		if (!p)
+			return -ENOMEM;
+		gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */
+		if (copy_from_user(gf32, optval, optlen)) {
+			err = -EFAULT;
+			goto mc_msf_out;
+		}
+
+		n = gf32->gf_numsrc;
+		/* numsrc >= (4G-140)/128 overflow in 32 bits */
+		if (n >= 0x1ffffff) {
+			err = -ENOBUFS;
+			goto mc_msf_out;
+		}
+		if (offsetof(struct compat_group_filter, gf_slist[n]) > optlen) {
+			err = -EINVAL;
+			goto mc_msf_out;
+		}
+
+		rtnl_lock();
+		lock_sock(sk);
+		/* numsrc >= (4G-140)/128 overflow in 32 bits */
+		if (n > sock_net(sk)->ipv4.sysctl_igmp_max_msf)
+			err = -ENOBUFS;
+		else
+			err = set_mcast_msfilter(sk, gf32->gf_interface,
+						 n, gf32->gf_fmode,
+						 &gf32->gf_group, gf32->gf_slist);
+		release_sock(sk);
+		rtnl_unlock();
+mc_msf_out:
+		kfree(p);
+		return err;
+	}
+	}
 
 	err = do_ip_setsockopt(sk, level, optname, optval, optlen);
 #ifdef CONFIG_NETFILTER
@@ -1465,19 +1581,28 @@ static int do_ip_getsockopt(struct sock *sk, int level, int optname,
 	}
 	case MCAST_MSFILTER:
 	{
+		struct group_filter __user *p = (void __user *)optval;
 		struct group_filter gsf;
+		const int size0 = offsetof(struct group_filter, gf_slist);
+		int num;
 
-		if (len < GROUP_FILTER_SIZE(0)) {
+		if (len < size0) {
 			err = -EINVAL;
 			goto out;
 		}
-		if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
+		if (copy_from_user(&gsf, p, size0)) {
 			err = -EFAULT;
 			goto out;
 		}
-		err = ip_mc_gsfget(sk, &gsf,
-				   (struct group_filter __user *)optval,
-				   optlen);
+		num = gsf.gf_numsrc;
+		err = ip_mc_gsfget(sk, &gsf, p->gf_slist);
+		if (err)
+			goto out;
+		if (gsf.gf_numsrc < num)
+			num = gsf.gf_numsrc;
+		if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
+		    copy_to_user(p, &gsf, size0))
+			err = -EFAULT;
 		goto out;
 	}
 	case IP_MULTICAST_ALL:
@@ -1590,9 +1715,47 @@ int compat_ip_getsockopt(struct sock *sk, int level, int optname,
 {
 	int err;
 
-	if (optname == MCAST_MSFILTER)
-		return compat_mc_getsockopt(sk, level, optname, optval, optlen,
-			ip_getsockopt);
+	if (optname == MCAST_MSFILTER) {
+		const int size0 = offsetof(struct compat_group_filter, gf_slist);
+		struct compat_group_filter __user *p = (void __user *)optval;
+		struct compat_group_filter gf32;
+		struct group_filter gf;
+		int ulen, err;
+		int num;
+
+		if (level != SOL_IP)
+			return -EOPNOTSUPP;
+
+		if (get_user(ulen, optlen))
+			return -EFAULT;
+
+		if (ulen < size0)
+			return -EINVAL;
+
+		if (copy_from_user(&gf32, p, size0))
+			return -EFAULT;
+
+		gf.gf_interface = gf32.gf_interface;
+		gf.gf_fmode = gf32.gf_fmode;
+		num = gf.gf_numsrc = gf32.gf_numsrc;
+		gf.gf_group = gf32.gf_group;
+
+		rtnl_lock();
+		lock_sock(sk);
+		err = ip_mc_gsfget(sk, &gf, p->gf_slist);
+		release_sock(sk);
+		rtnl_unlock();
+		if (err)
+			return err;
+		if (gf.gf_numsrc < num)
+			num = gf.gf_numsrc;
+		ulen = GROUP_FILTER_SIZE(num) - (sizeof(gf) - sizeof(gf32));
+		if (put_user(ulen, optlen) ||
+		    put_user(gf.gf_fmode, &p->gf_fmode) ||
+		    put_user(gf.gf_numsrc, &p->gf_numsrc))
+			return -EFAULT;
+		return 0;
+	}
 
 	err = do_ip_getsockopt(sk, level, optname, optval, optlen,
 		MSG_CMSG_COMPAT);

net/ipv6/ipv6_sockglue.c

@@ -136,6 +136,41 @@ static bool setsockopt_needs_rtnl(int optname)
 	return false;
 }
 
+static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
+				      struct group_source_req *greqs)
+{
+	int omode, add;
+
+	if (greqs->gsr_group.ss_family != AF_INET6 ||
+	    greqs->gsr_source.ss_family != AF_INET6)
+		return -EADDRNOTAVAIL;
+
+	if (optname == MCAST_BLOCK_SOURCE) {
+		omode = MCAST_EXCLUDE;
+		add = 1;
+	} else if (optname == MCAST_UNBLOCK_SOURCE) {
+		omode = MCAST_EXCLUDE;
+		add = 0;
+	} else if (optname == MCAST_JOIN_SOURCE_GROUP) {
+		struct sockaddr_in6 *psin6;
+		int retv;
+
+		psin6 = (struct sockaddr_in6 *)&greqs->gsr_group;
+		retv = ipv6_sock_mc_join_ssm(sk, greqs->gsr_interface,
+					     &psin6->sin6_addr,
+					     MCAST_INCLUDE);
+		/* prior join w/ different source is ok */
+		if (retv && retv != -EADDRINUSE)
+			return retv;
+		omode = MCAST_INCLUDE;
+		add = 1;
+	} else /* MCAST_LEAVE_SOURCE_GROUP */ {
+		omode = MCAST_INCLUDE;
+		add = 0;
+	}
+	return ip6_mc_source(add, omode, sk, greqs);
+}
+
 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 		    char __user *optval, unsigned int optlen)
 {
@@ -715,7 +750,6 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 	case MCAST_UNBLOCK_SOURCE:
 	{
 		struct group_source_req greqs;
-		int omode, add;
 
 		if (optlen < sizeof(struct group_source_req))
 			goto e_inval;
@@ -723,34 +757,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 			retv = -EFAULT;
 			break;
 		}
-		if (greqs.gsr_group.ss_family != AF_INET6 ||
-		    greqs.gsr_source.ss_family != AF_INET6) {
-			retv = -EADDRNOTAVAIL;
-			break;
-		}
-		if (optname == MCAST_BLOCK_SOURCE) {
-			omode = MCAST_EXCLUDE;
-			add = 1;
-		} else if (optname == MCAST_UNBLOCK_SOURCE) {
-			omode = MCAST_EXCLUDE;
-			add = 0;
-		} else if (optname == MCAST_JOIN_SOURCE_GROUP) {
-			struct sockaddr_in6 *psin6;
-
-			psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
-			retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
-						     &psin6->sin6_addr,
-						     MCAST_INCLUDE);
-			/* prior join w/ different source is ok */
-			if (retv && retv != -EADDRINUSE)
-				break;
-			omode = MCAST_INCLUDE;
-			add = 1;
-		} else /* MCAST_LEAVE_SOURCE_GROUP */ {
-			omode = MCAST_INCLUDE;
-			add = 0;
-		}
-		retv = ip6_mc_source(add, omode, sk, &greqs);
+		retv = do_ipv6_mcast_group_source(sk, optname, &greqs);
 		break;
 	}
 	case MCAST_MSFILTER:
@@ -780,7 +787,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 			retv = -EINVAL;
 			break;
 		}
-		retv = ip6_mc_msfilter(sk, gsf);
+		retv = ip6_mc_msfilter(sk, gsf, gsf->gf_slist);
 		kfree(gsf);
 
 		break;
@@ -973,9 +980,110 @@ int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 	if (level != SOL_IPV6)
 		return -ENOPROTOOPT;
 
-	if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
-		return compat_mc_setsockopt(sk, level, optname, optval, optlen,
-			ipv6_setsockopt);
+	switch (optname) {
+	case MCAST_JOIN_GROUP:
+	case MCAST_LEAVE_GROUP:
+	{
+		struct compat_group_req __user *gr32 = (void __user *)optval;
+		struct group_req greq;
+		struct sockaddr_in6 *psin6 = (struct sockaddr_in6 *)&greq.gr_group;
+
+		if (optlen < sizeof(struct compat_group_req))
+			return -EINVAL;
+
+		if (get_user(greq.gr_interface, &gr32->gr_interface) ||
+		    copy_from_user(&greq.gr_group, &gr32->gr_group,
+				sizeof(greq.gr_group)))
+			return -EFAULT;
+
+		if (greq.gr_group.ss_family != AF_INET6)
+			return -EADDRNOTAVAIL;
+
+		rtnl_lock();
+		lock_sock(sk);
+		if (optname == MCAST_JOIN_GROUP)
+			err = ipv6_sock_mc_join(sk, greq.gr_interface,
+						 &psin6->sin6_addr);
+		else
+			err = ipv6_sock_mc_drop(sk, greq.gr_interface,
+						 &psin6->sin6_addr);
+		release_sock(sk);
+		rtnl_unlock();
+		return err;
+	}
+	case MCAST_JOIN_SOURCE_GROUP:
+	case MCAST_LEAVE_SOURCE_GROUP:
+	case MCAST_BLOCK_SOURCE:
+	case MCAST_UNBLOCK_SOURCE:
+	{
+		struct compat_group_source_req __user *gsr32 = (void __user *)optval;
+		struct group_source_req greqs;
+
+		if (optlen < sizeof(struct compat_group_source_req))
+			return -EINVAL;
+
+		if (get_user(greqs.gsr_interface, &gsr32->gsr_interface) ||
+		    copy_from_user(&greqs.gsr_group, &gsr32->gsr_group,
+				sizeof(greqs.gsr_group)) ||
+		    copy_from_user(&greqs.gsr_source, &gsr32->gsr_source,
+				sizeof(greqs.gsr_source)))
+			return -EFAULT;
+
+		rtnl_lock();
+		lock_sock(sk);
+		err = do_ipv6_mcast_group_source(sk, optname, &greqs);
+		release_sock(sk);
+		rtnl_unlock();
+		return err;
+	}
+	case MCAST_MSFILTER:
+	{
+		const int size0 = offsetof(struct compat_group_filter, gf_slist);
+		struct compat_group_filter *gf32;
+		void *p;
+		int n;
+
+		if (optlen < size0)
+			return -EINVAL;
+		if (optlen > sysctl_optmem_max - 4)
+			return -ENOBUFS;
+
+		p = kmalloc(optlen + 4, GFP_KERNEL);
+		if (!p)
+			return -ENOMEM;
+
+		gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */
+		if (copy_from_user(gf32, optval, optlen)) {
+			err = -EFAULT;
+			goto mc_msf_out;
+		}
+
+		n = gf32->gf_numsrc;
+		/* numsrc >= (4G-140)/128 overflow in 32 bits */
+		if (n >= 0x1ffffffU ||
+		    n > sysctl_mld_max_msf) {
+			err = -ENOBUFS;
+			goto mc_msf_out;
+		}
+		if (offsetof(struct compat_group_filter, gf_slist[n]) > optlen) {
+			err = -EINVAL;
+			goto mc_msf_out;
+		}
+
+		rtnl_lock();
+		lock_sock(sk);
+		err = ip6_mc_msfilter(sk, &(struct group_filter){
+				.gf_interface = gf32->gf_interface,
+				.gf_group = gf32->gf_group,
+				.gf_fmode = gf32->gf_fmode,
+				.gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist);
+		release_sock(sk);
+		rtnl_unlock();
+mc_msf_out:
+		kfree(p);
+		return err;
+	}
+	}
 
 	err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
 #ifdef CONFIG_NETFILTER
@@ -1048,18 +1156,28 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 		break;
 	case MCAST_MSFILTER:
 	{
+		struct group_filter __user *p = (void __user *)optval;
 		struct group_filter gsf;
+		const int size0 = offsetof(struct group_filter, gf_slist);
+		int num;
 		int err;
 
-		if (len < GROUP_FILTER_SIZE(0))
+		if (len < size0)
 			return -EINVAL;
-		if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
+		if (copy_from_user(&gsf, p, size0))
 			return -EFAULT;
 		if (gsf.gf_group.ss_family != AF_INET6)
 			return -EADDRNOTAVAIL;
+		num = gsf.gf_numsrc;
 		lock_sock(sk);
-		err = ip6_mc_msfget(sk, &gsf,
-			(struct group_filter __user *)optval, optlen);
+		err = ip6_mc_msfget(sk, &gsf, p->gf_slist);
+		if (!err) {
+			if (num > gsf.gf_numsrc)
+				num = gsf.gf_numsrc;
+			if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
+			    copy_to_user(p, &gsf, size0))
+				err = -EFAULT;
+		}
 		release_sock(sk);
 		return err;
 	}
@@ -1428,9 +1546,44 @@ int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
 	if (level != SOL_IPV6)
 		return -ENOPROTOOPT;
 
-	if (optname == MCAST_MSFILTER)
-		return compat_mc_getsockopt(sk, level, optname, optval, optlen,
-			ipv6_getsockopt);
+	if (optname == MCAST_MSFILTER) {
+		const int size0 = offsetof(struct compat_group_filter, gf_slist);
+		struct compat_group_filter __user *p = (void __user *)optval;
+		struct compat_group_filter gf32;
+		struct group_filter gf;
+		int ulen, err;
+		int num;
+
+		if (get_user(ulen, optlen))
+			return -EFAULT;
+
+		if (ulen < size0)
+			return -EINVAL;
+
+		if (copy_from_user(&gf32, p, size0))
+			return -EFAULT;
+
+		gf.gf_interface = gf32.gf_interface;
+		gf.gf_fmode = gf32.gf_fmode;
+		num = gf.gf_numsrc = gf32.gf_numsrc;
+		gf.gf_group = gf32.gf_group;
+
+		if (gf.gf_group.ss_family != AF_INET6)
+			return -EADDRNOTAVAIL;
+		lock_sock(sk);
+		err = ip6_mc_msfget(sk, &gf, p->gf_slist);
+		release_sock(sk);
+		if (err)
+			return err;
+		if (num > gf.gf_numsrc)
+			num = gf.gf_numsrc;
+		ulen = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
+		if (put_user(ulen, optlen) ||
+		    put_user(gf.gf_fmode, &p->gf_fmode) ||
+		    put_user(gf.gf_numsrc, &p->gf_numsrc))
+			return -EFAULT;
+		return 0;
+	}
 
 	err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
 				 MSG_CMSG_COMPAT);

net/ipv6/mcast.c

@@ -457,7 +457,8 @@ int ip6_mc_source(int add, int omode, struct sock *sk,
 	return err;
 }
 
-int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
+int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
+		    struct sockaddr_storage *list)
 {
 	const struct in6_addr *group;
 	struct ipv6_mc_socklist *pmc;
@@ -509,10 +510,10 @@ int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 			goto done;
 		}
 		newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
-		for (i = 0; i < newpsl->sl_count; ++i) {
+		for (i = 0; i < newpsl->sl_count; ++i, ++list) {
 			struct sockaddr_in6 *psin6;
 
-			psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
+			psin6 = (struct sockaddr_in6 *)list;
 			newpsl->sl_addr[i] = psin6->sin6_addr;
 		}
 		err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
@@ -547,7 +548,7 @@ int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 }
 
 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
-	struct group_filter __user *optval, int __user *optlen)
+	struct sockaddr_storage *p)
 {
 	int err, i, count, copycount;
 	const struct in6_addr *group;
@@ -592,14 +593,10 @@ int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 
 	copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 	gsf->gf_numsrc = count;
-	if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
-	    copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
-		return -EFAULT;
-	}
 	/* changes to psl require the socket lock, and a write lock
 	 * on pmc->sflock. We have the socket lock so reading here is safe.
 	 */
-	for (i = 0; i < copycount; i++) {
+	for (i = 0; i < copycount; i++, p++) {
 		struct sockaddr_in6 *psin6;
 		struct sockaddr_storage ss;
 
@@ -607,7 +604,7 @@ int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 		memset(&ss, 0, sizeof(ss));
 		psin6->sin6_family = AF_INET6;
 		psin6->sin6_addr = psl->sl_addr[i];
-		if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
+		if (copy_to_user(p, &ss, sizeof(ss)))
 			return -EFAULT;
 	}
 	return 0;