On Mon, Dec 16, 2024 at 12:37 PM Yuezhang.Mo@xxxxxxxx <Yuezhang.Mo@xxxxxxxx> wrote: > > If the file system is corrupted so that a cluster is linked to > itself in the cluster chain, and there is an unused directory > entry in the cluster, 'dentry' will not be incremented, causing > condition 'dentry < max_dentries' unable to prevent an infinite > loop. > > This infinite loop causes s_lock not to be released, and other > tasks will hang, such as exfat_sync_fs(). > > This commit stops traversing the cluster chain when there is unused > directory entry in the cluster to avoid this infinite loop. > > Reported-by: syzbot+205c2644abdff9d3f9fc@xxxxxxxxxxxxxxxxxxxxxxxxx > Closes: https://syzkaller.appspot.com/bug?extid=205c2644abdff9d3f9fc > Tested-by: syzbot+205c2644abdff9d3f9fc@xxxxxxxxxxxxxxxxxxxxxxxxx > Fixes: ca06197382bd ("exfat: add directory operations") > Signed-off-by: Yuezhang Mo <Yuezhang.Mo@xxxxxxxx> Applied it to #dev. Thanks!
