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authorJan Kara <jack@suse.cz>2017-10-31 11:53:28 +0300
committerJan Kara <jack@suse.cz>2017-10-31 19:41:04 +0300
commitb3a0066005821acdc0cdb092cb72587182ab583f (patch)
tree9372eb76b9f3d2242c2a6ac5c8724f7546cd5e98 /fs/notify
parentff5abbe799e29099695cb8b5b2f198dd8b8bdf26 (diff)
downloadlinux-b3a0066005821acdc0cdb092cb72587182ab583f.tar.xz
dnotify: Handle errors from fsnotify_add_mark_locked() in fcntl_dirnotify()
fsnotify_add_mark_locked() can fail but we do not check its return value. This didn't matter before commit 9dd813c15b2c "fsnotify: Move mark list head from object into dedicated structure" as none of possible failures could happen for dnotify but after that commit -ENOMEM can be returned. Handle this error properly in fcntl_dirnotify() as otherwise we just hit BUG_ON(dn_mark->dn) in dnotify_free_mark(). Reviewed-by: Amir Goldstein <amir73il@gmail.com> Reported-by: syzkaller Fixes: 9dd813c15b2c101168808d4f5941a29985758973 Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/notify')
-rw-r--r--fs/notify/dnotify/dnotify.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c
index cba328315929..63a1ca4b9dee 100644
--- a/fs/notify/dnotify/dnotify.c
+++ b/fs/notify/dnotify/dnotify.c
@@ -319,7 +319,11 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg)
dn_mark = container_of(fsn_mark, struct dnotify_mark, fsn_mark);
spin_lock(&fsn_mark->lock);
} else {
- fsnotify_add_mark_locked(new_fsn_mark, inode, NULL, 0);
+ error = fsnotify_add_mark_locked(new_fsn_mark, inode, NULL, 0);
+ if (error) {
+ mutex_unlock(&dnotify_group->mark_mutex);
+ goto out_err;
+ }
spin_lock(&new_fsn_mark->lock);
fsn_mark = new_fsn_mark;
dn_mark = new_dn_mark;
@@ -345,6 +349,7 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg)
*/
if (dn_mark == new_dn_mark)
destroy = 1;
+ error = 0;
goto out;
}