From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 5 May 2015 14:52:35 +0000 (-0400)
Subject: namei: move bumping the refcount of link->mnt into pick_link()
X-Git-Tag: v4.9.8~3944^2~80
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=cd179f4468acfda2b7e9e236dc37bba815996421;p=platform%2Fkernel%2Flinux-rpi3.git

namei: move bumping the refcount of link->mnt into pick_link()

update the failure cleanup in may_follow_link() to match that.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/namei.c b/fs/namei.c
index 55283fe..05efcc0 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -802,7 +802,7 @@ static inline int may_follow_link(struct path *link, struct nameidata *nd)
 		return 0;
 
 	audit_log_link_denied("follow_link", link);
-	path_put_conditional(link, nd);
+	path_put(link);
 	path_put(&nd->path);
 	return -EACCES;
 }
@@ -887,9 +887,6 @@ const char *get_link(struct nameidata *nd)
 
 	BUG_ON(nd->flags & LOOKUP_RCU);
 
-	if (nd->link.mnt == nd->path.mnt)
-		mntget(nd->link.mnt);
-
 	last->link = nd->link;
 	last->cookie = NULL;
 	nd->depth++;
@@ -1574,9 +1571,11 @@ static int pick_link(struct nameidata *nd, struct path *link)
 			return -ECHILD;
 		}
 	}
+	if (link->mnt == nd->path.mnt)
+		mntget(link->mnt);
 	error = nd_alloc_stack(nd);
 	if (unlikely(error)) {
-		path_to_nameidata(link, nd);
+		path_put(link);
 		return error;
 	}