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authorJan Kara <jack@suse.cz>2018-08-20 13:55:45 +0200
committerJan Kara <jack@suse.cz>2018-08-20 13:55:45 +0200
commitd3bc0fa8411c35194f99046157e2e26fe60e1d91 (patch)
treef2aaa5ecaec7b925cc3413d8de564bc9f01ed14b /fs/notify/mark.c
parentMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net (diff)
downloadlinux-d3bc0fa8411c35194f99046157e2e26fe60e1d91.tar.xz
linux-d3bc0fa8411c35194f99046157e2e26fe60e1d91.zip
fsnotify: fix false positive warning on inode delete
When inode is getting deleted and someone else holds reference to a mark attached to the inode, we just detach the connector from the inode. In that case fsnotify_put_mark() called from fsnotify_destroy_marks() will decide to recalculate mask for the inode and __fsnotify_recalc_mask() will WARN about invalid connector type: WARNING: CPU: 1 PID: 12015 at fs/notify/mark.c:139 __fsnotify_recalc_mask+0x2d7/0x350 fs/notify/mark.c:139 Actually there's no reason to warn about detached connector in __fsnotify_recalc_mask() so just silently skip updating the mask in such case. Reported-by: syzbot+c34692a51b9a6ca93540@syzkaller.appspotmail.com Fixes: 3ac70bfcde81 ("fsnotify: add helper to get mask from connector") Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/notify/mark.c')
-rw-r--r--fs/notify/mark.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index 05506d60131c..59cdb27826de 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -132,13 +132,13 @@ static void __fsnotify_recalc_mask(struct fsnotify_mark_connector *conn)
struct fsnotify_mark *mark;
assert_spin_locked(&conn->lock);
+ /* We can get detached connector here when inode is getting unlinked. */
+ if (!fsnotify_valid_obj_type(conn->type))
+ return;
hlist_for_each_entry(mark, &conn->list, obj_list) {
if (mark->flags & FSNOTIFY_MARK_FLAG_ATTACHED)
new_mask |= mark->mask;
}
- if (WARN_ON(!fsnotify_valid_obj_type(conn->type)))
- return;
-
*fsnotify_conn_mask_p(conn) = new_mask;
}