linux-kernel - Re: [PATCH (REPOST)] hfs: don't use BUG() when we can continue

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Message-ID: <24e72990-2c48-4084-b229-21161cc27851@I-love.SAKURA.ne.jp>
Date: Wed, 25 Jun 2025 14:03:20 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: Matthew Wilcox <willy@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH (REPOST)] hfs: don't use BUG() when we can continue

Matthew, any comments?

On 2024/12/05 23:14, Tetsuo Handa wrote:
> On 2024/12/05 22:59, Matthew Wilcox wrote:
>> On Thu, Dec 05, 2024 at 10:45:11PM +0900, Tetsuo Handa wrote:
>>> syzkaller can mount crafted filesystem images.
>>> Don't crash the kernel when we can continue.
>>
>> The one in hfs_test_inode() makes sense, but we should never get to
>> hfs_release_folio() or hfs_write_inode() with a bad inode, even with a
>> corrupted fs.  Right?
> 
> Unfortunately, https://syzkaller.appspot.com/bug?extid=97e301b4b82ae803d21b
> reports that we can reach hfs_write_inode() with a corrupted filesystem.
> If we should never get to hfs_write_inode(), how do we want to handle
> this problem? Is someone familiar with hfs enough to perform an in-kernel
> fsck upon mounting?
>