From: Ian Kent <raven@themaw.net>
Date: Thu, 1 May 2008 11:35:07 +0000 (-0700)
Subject: autofs4: check for invalid dentry in getpath
X-Git-Tag: upstream/snapshot3+hdmi~25220
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=cab0936aac8aa907c6bb814c2cf26385478f254b;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

autofs4: check for invalid dentry in getpath

Catch invalid dentry when calculating its path.

Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index 1fe28e4..75e5955 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -171,7 +171,7 @@ static int autofs4_getpath(struct autofs_sb_info *sbi,
 	for (tmp = dentry ; tmp != root ; tmp = tmp->d_parent)
 		len += tmp->d_name.len + 1;
 
-	if (--len > NAME_MAX) {
+	if (!len || --len > NAME_MAX) {
 		spin_unlock(&dcache_lock);
 		return 0;
 	}