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authorYuezhang Mo <Yuezhang.Mo@sony.com>2024-12-13 08:08:37 +0300
committerNamjae Jeon <linkinjeon@kernel.org>2024-12-31 11:49:40 +0300
commitfee873761bd978d077d8c55334b4966ac4cb7b59 (patch)
treee3cdf91d80cad81dbf118239129d76ce02dd06d8 /tools/perf/scripts/python/libxed.py
parent70465acbb0ce1bb69447acf32f136c8153cda0de (diff)
downloadlinux-fee873761bd978d077d8c55334b4966ac4cb7b59.tar.xz
exfat: fix the infinite loop in exfat_readdir()
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@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=205c2644abdff9d3f9fc Tested-by: syzbot+205c2644abdff9d3f9fc@syzkaller.appspotmail.com Fixes: ca06197382bd ("exfat: add directory operations") Signed-off-by: Yuezhang Mo <Yuezhang.Mo@sony.com> Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
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