linux-kernel - Re: [PATCH] autofs: fix null deref in autofs_fill

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Message-ID: <dcd50f92-e0e3-9a24-daf1-f2402f06518f@themaw.net>
Date:   Wed, 15 Nov 2023 09:06:48 +0800
From:   Ian Kent <raven@...maw.net>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Edward Adam Davis <eadavis@...com>,
        syzbot+662f87a8ef490f45fa64@...kaller.appspotmail.com,
        autofs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] autofs: fix null deref in autofs_fill_super

On 15/11/23 08:35, Al Viro wrote:
> On Wed, Nov 15, 2023 at 08:18:33AM +0800, Ian Kent wrote:
>
>> I guess that including the locking is not going to make much difference.
>>
>> I don't remember now but it was probably done because there may be many
>>
>> mounts (potentially several thousand) being done and I wanted to get rid
>>
>> of anything that wasn't needed.
> Seeing that lock in question is not going to be contended... ;-)
>
> Seriously, though - the fewer complications we have in the locking rules,
> the better.

Sure, no problem, I'll make that change.

I do need to do a compile and test it actually ok works so it's

taking a little while.


Ian

>
> Al, currently going through audit of ->d_name/->d_parent uses and cursing
> at the 600-odd places left to look through...