[PATCH] vfs: namespace: error pointer dereference in do_remount()

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

We need to check if vfs_new_fs_context() returns an error pointer.

Fixes: fd0002870b45 ("vfs: Implement a filesystem superblock creation/configuration context")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/fs/namespace.c b/fs/namespace.c
index a240e20093e0..841517520c08 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2384,6 +2384,8 @@ static int do_remount(struct path *path, int ms_flags, int sb_flags,
 	fc = vfs_new_fs_context(path->dentry->d_sb->s_type,
 				path->dentry, sb_flags, MS_RMT_MASK,
 				FS_CONTEXT_FOR_RECONFIGURE);
+	if (IS_ERR(fc))
+		return PTR_ERR(fc);
 
 	err = parse_monolithic_mount_data(fc, data, data_size);
 	if (err < 0)