linux-kernel - Re: [syzbot] KASAN: use-after-free Read in __media_entity_remove

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Message-ID: <20231121214541.GB3909@pendragon.ideasonboard.com>
Date:   Tue, 21 Nov 2023 23:45:41 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     syzbot <syzbot+0b0095300dfeb8a83dc8@...kaller.appspotmail.com>
Cc:     andreyknvl@...gle.com, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-usb@...r.kernel.org,
        mchehab@...nel.org, nogikh@...gle.com,
        sakari.ailus@...ux.intel.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KASAN: use-after-free Read in
 __media_entity_remove_links

On Tue, Nov 21, 2023 at 01:13:15PM -0800, syzbot wrote:
> This bug is marked as fixed by commit:
> media: uvcvideo: Avoid cyclic entity chains due to malformed USB descriptors
> 
> But I can't find it in the tested trees[1] for more than 90 days.
> Is it a correct commit? Please update it by replying:
> 
> #syz fix: exact-commit-title

What logic does syzbot use to try and find the commit upstream ? There's
a commit with the exact same subject, what was missing to find it
automatically ?

> Until then the bug is still considered open and new crashes with
> the same signature are ignored.
> 
> Kernel: Linux
> Dashboard link: https://syzkaller.appspot.com/bug?extid=0b0095300dfeb8a83dc8
> 
> ---
> [1] I expect the commit to be present in:
> 
> 1. for-kernelci branch of
> git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git
> 
> 2. master branch of
> git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git
> 
> 3. master branch of
> git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git
> 
> 4. main branch of
> git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git
> 
> The full list of 9 trees can be found at
> https://syzkaller.appspot.com/upstream/repos

-- 
Regards,

Laurent Pinchart