Commit d7256d0e authored by Jean-Mickael Guerin's avatar Jean-Mickael Guerin Committed by David S. Miller

net: compat_mmsghdr must be used in sys_recvmmsg

Both to traverse the entries and to set the msg_len field.

Commiter note: folded two patches and avoided one branch repeating the
compat test.
Signed-off-by: default avatarJean-Mickael Guerin <jean-mickael.guerin@6wind.com>
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 810c0719
......@@ -2144,6 +2144,7 @@ int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
int fput_needed, err, datagrams;
struct socket *sock;
struct mmsghdr __user *entry;
struct compat_mmsghdr __user *compat_entry;
struct msghdr msg_sys;
struct timespec end_time;
......@@ -2163,19 +2164,30 @@ int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
goto out_put;
entry = mmsg;
compat_entry = (struct compat_mmsghdr __user *)mmsg;
while (datagrams < vlen) {
/*
* No need to ask LSM for more than the first datagram.
*/
err = __sys_recvmsg(sock, (struct msghdr __user *)entry,
&msg_sys, flags, datagrams);
if (err < 0)
break;
err = put_user(err, &entry->msg_len);
if (MSG_CMSG_COMPAT & flags) {
err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
&msg_sys, flags, datagrams);
if (err < 0)
break;
err = __put_user(err, &compat_entry->msg_len);
++compat_entry;
} else {
err = __sys_recvmsg(sock, (struct msghdr __user *)entry,
&msg_sys, flags, datagrams);
if (err < 0)
break;
err = put_user(err, &entry->msg_len);
++entry;
}
if (err)
break;
++entry;
++datagrams;
if (timeout) {
......
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