From: Amy Griffis <amy.griffis@hp.com>
Date: Sat, 20 May 2006 22:00:07 +0000 (-0700)
Subject: [PATCH] fix NULL dereference in inotify_ignore
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=d66fd908acc8ba88541ecc570d89b0243f947c5e;p=deliverable%2Flinux.git

[PATCH] fix NULL dereference in inotify_ignore

Don't reassign to watch.  If idr_find() returns NULL, then
put_inotify_watch() will choke.

Signed-off-by: Amy Griffis <amy.griffis@hp.com>
Cc: John McCutchan <john@johnmccutchan.com>
Cc: Robert Love <rlove@rlove.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/fs/inotify.c b/fs/inotify.c
index 7d5725336527..732ec4bd5774 100644
--- a/fs/inotify.c
+++ b/fs/inotify.c
@@ -894,8 +894,7 @@ static int inotify_ignore(struct inotify_device *dev, s32 wd)
 	mutex_lock(&dev->mutex);
 
 	/* make sure that we did not race */
-	watch = idr_find(&dev->idr, wd);
-	if (likely(watch))
+	if (likely(idr_find(&dev->idr, wd) == watch))
 		remove_watch(watch, dev);
 
 	mutex_unlock(&dev->mutex);