Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull vfs fixes from Al Viro:
 "A couple of regression fixes"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  fix iov_iter_advance() for ITER_PIPE
  xattr: Fix setting security xattrs on sockfs

fs/xattr.c

@@ -170,7 +170,7 @@ int __vfs_setxattr_noperm(struct dentry *dentry, const char *name,
 		const void *value, size_t size, int flags)
 {
 	struct inode *inode = dentry->d_inode;
-	int error = -EOPNOTSUPP;
+	int error = -EAGAIN;
 	int issec = !strncmp(name, XATTR_SECURITY_PREFIX,
 				   XATTR_SECURITY_PREFIX_LEN);
 
@@ -183,16 +183,22 @@ int __vfs_setxattr_noperm(struct dentry *dentry, const char *name,
 			security_inode_post_setxattr(dentry, name, value,
 						     size, flags);
 		}
-	} else if (issec) {
-		const char *suffix = name + XATTR_SECURITY_PREFIX_LEN;
-
+	} else {
 		if (unlikely(is_bad_inode(inode)))
 			return -EIO;
+	}
+	if (error == -EAGAIN) {
+		error = -EOPNOTSUPP;
+
+		if (issec) {
+			const char *suffix = name + XATTR_SECURITY_PREFIX_LEN;
+
 			error = security_inode_setsecurity(inode, suffix, value,
 							   size, flags);
 			if (!error)
 				fsnotify_xattr(dentry);
 		}
+	}
 
 	return error;
 }

lib/iov_iter.c

@@ -683,10 +683,11 @@ static void pipe_advance(struct iov_iter *i, size_t size)
 	struct pipe_inode_info *pipe = i->pipe;
 	struct pipe_buffer *buf;
 	int idx = i->idx;
-	size_t off = i->iov_offset;
+	size_t off = i->iov_offset, orig_sz;
 	
 	if (unlikely(i->count < size))
 		size = i->count;
+	orig_sz = size;
 
 	if (size) {
 		if (off) /* make it relative to the beginning of buffer */
@@ -713,6 +714,7 @@ static void pipe_advance(struct iov_iter *i, size_t size)
 			pipe->nrbufs--;
 		}
 	}
+	i->count -= orig_sz;
 }
 
 void iov_iter_advance(struct iov_iter *i, size_t size)

net/socket.c

@@ -341,8 +341,23 @@ static const struct xattr_handler sockfs_xattr_handler = {
 	.get = sockfs_xattr_get,
 };
 
+static int sockfs_security_xattr_set(const struct xattr_handler *handler,
+				     struct dentry *dentry, struct inode *inode,
+				     const char *suffix, const void *value,
+				     size_t size, int flags)
+{
+	/* Handled by LSM. */
+	return -EAGAIN;
+}
+
+static const struct xattr_handler sockfs_security_xattr_handler = {
+	.prefix = XATTR_SECURITY_PREFIX,
+	.set = sockfs_security_xattr_set,
+};
+
 static const struct xattr_handler *sockfs_xattr_handlers[] = {
 	&sockfs_xattr_handler,
+	&sockfs_security_xattr_handler,
 	NULL
 };