From: ZhangXiaoxu <zhangxiaoxu5@huawei.com>
Date: Sat, 2 Mar 2019 01:17:32 +0000 (+0800)
Subject: inotify: Fix fsnotify_mark refcount leak in inotify_update_existing_watch()
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=62c9d2674b31d4c8a674bee86b7edc6da2803aea;p=openwrt%2Fstaging%2Fblogic.git

inotify: Fix fsnotify_mark refcount leak in inotify_update_existing_watch()

Commit 4d97f7d53da7dc83 ("inotify: Add flag IN_MASK_CREATE for
inotify_add_watch()") forgot to call fsnotify_put_mark() with
IN_MASK_CREATE after fsnotify_find_mark()

Fixes: 4d97f7d53da7dc83 ("inotify: Add flag IN_MASK_CREATE for inotify_add_watch()")
Signed-off-by: ZhangXiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Jan Kara <jack@suse.cz>
---

diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index e2901fbb9f76..7b53598c8804 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -519,8 +519,10 @@ static int inotify_update_existing_watch(struct fsnotify_group *group,
 	fsn_mark = fsnotify_find_mark(&inode->i_fsnotify_marks, group);
 	if (!fsn_mark)
 		return -ENOENT;
-	else if (create)
-		return -EEXIST;
+	else if (create) {
+		ret = -EEXIST;
+		goto out;
+	}
 
 	i_mark = container_of(fsn_mark, struct inotify_inode_mark, fsn_mark);
 
@@ -548,6 +550,7 @@ static int inotify_update_existing_watch(struct fsnotify_group *group,
 	/* return the wd */
 	ret = i_mark->wd;
 
+out:
 	/* match the get from fsnotify_find_mark() */
 	fsnotify_put_mark(fsn_mark);