RCU pathwalk breakage when running into a symlink overmounting something

commit 3cab989a upstream.

Calling unlazy_walk() in walk_component() and do_last() when we find
a symlink that needs to be followed doesn't acquire a reference to vfsmount.
That's fine when the symlink is on the same vfsmount as the parent directory
(which is almost always the case), but it's not always true - one _can_
manage to bind a symlink on top of something.  And in such cases we end up
with excessive mntput().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[lizf: Backported to 3.4: drop the changes to do_last()]
Signed-off-by: Zefan Li <lizefan@huawei.com>

fs/namei.c

@@ -1314,7 +1314,8 @@ static inline int walk_component(struct nameidata *nd, struct path *path,
 	}
 	if (should_follow_link(inode, follow)) {
 		if (nd->flags & LOOKUP_RCU) {
-			if (unlikely(unlazy_walk(nd, path->dentry))) {
+			if (unlikely(nd->path.mnt != path->mnt ||
+				     unlazy_walk(nd, path->dentry))) {
 				terminate_walk(nd);
 				return -ECHILD;
 			}