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

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Date:   Mon, 4 Jul 2022 09:51:15 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+39e3268af9968f153591@...kaller.appspotmail.com>
Cc:     alsa-devel-owner@...a-project.org, alsa-devel@...a-project.org,
        anthony.l.nguyen@...el.com, clemens@...isch.de, coding@...ic.se,
        colin.king@...el.com, hdanton@...a.com,
        linux-kernel@...r.kernel.org, naamax.meir@...ux.intel.com,
        perex@...ex.cz, sasha.neftin@...el.com,
        syzkaller-bugs@...glegroups.com, tiwai@...e.com, tiwai@...e.de
Subject: Re: [syzbot] KASAN: use-after-free Read in snd_rawmidi_transmit

On Fri, 1 Jul 2022 at 21:21, syzbot
<syzbot+39e3268af9968f153591@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 0125de38122f0f66bf61336158d12a1aabfe6425
> Author: Takashi Iwai <tiwai@...e.de>
> Date:   Wed May 25 13:12:03 2022 +0000
>
>     ALSA: usb-audio: Cancel pending work at closing a MIDI substream
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1180b25c080000
> start commit:   2a5699b0de4e Merge tag 'leds-5.19-rc1' of git://git.kernel..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=f915857c44e13980
> dashboard link: https://syzkaller.appspot.com/bug?extid=39e3268af9968f153591
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=119d1fcbf00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17716bedf00000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: ALSA: usb-audio: Cancel pending work at closing a MIDI substream
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Looks reasonable:

#syz fix: ALSA: usb-audio: Cancel pending work at closing a MIDI substream