linux-kernel - [PATCH 4/6] fanotify: only destroy a mark if both its mask and its ignored

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Message-ID: <20101202100709.GE5196@lsanfilippo.unix.rd.tt.avira.com>
Date:	Thu, 2 Dec 2010 11:07:09 +0100
From:	Lino Sanfilippo <LinoSanfilippo@....de>
To:	eparis@...hat.com
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH 4/6] fanotify: only destroy a mark if both its mask and its
	ignored_mask are cleared


Currently we destroy a mark if one of its masks - event mask or ignored mask - are
cleared without checking if the other mask is also clear.

With this patch we only destroy a mark if both masks are cleared.

Signed-off-by: Lino Sanfilippo <LinoSanfilippo@....de>
---
 fs/notify/fanotify/fanotify_user.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index c9cd1b9..6b9606a 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -517,6 +517,7 @@ static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,
 					    unsigned int flags)
 {
 	__u32 oldmask;
+	int destroy_mark;
 
 	spin_lock(&fsn_mark->lock);
 	if (!(flags & FAN_MARK_IGNORED_MASK)) {
@@ -526,9 +527,10 @@ static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,
 		oldmask = fsn_mark->ignored_mask;
 		fsnotify_set_mark_ignored_mask_locked(fsn_mark, (oldmask & ~mask));
 	}
+	destroy_mark = (!fsn_mark->mask && !fsn_mark->ignored_mask);
 	spin_unlock(&fsn_mark->lock);
 
-	if (!(oldmask & ~mask))
+	if (destroy_mark)
 		fsnotify_destroy_mark(fsn_mark);
 
 	return mask & oldmask;
-- 
1.5.6.5

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