Commit d66fd908 authored by Amy Griffis's avatar Amy Griffis Committed by Linus Torvalds
Browse files

[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: default avatarAmy Griffis <amy.griffis@hp.com>
Cc: John McCutchan <john@johnmccutchan.com>
Cc: Robert Love <rlove@rlove.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 66055a4e
......@@ -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);
......
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