linux-kernel - Re: KMSAN: uninit-value in get_term

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Date:   Mon, 28 Oct 2019 14:38:20 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     syzbot <syzbot+8f2612936028bfd28f28@...kaller.appspotmail.com>,
        Allison Randal <allison@...utok.net>,
        alsa-devel@...a-project.org,
        彭辉 <benquike@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Takashi Iwai <tiwai@...e.com>, wang6495@....edu,
        yuehaibing@...wei.com
Subject: Re: KMSAN: uninit-value in get_term_name

On Mon, Oct 28, 2019 at 2:13 PM Takashi Iwai <tiwai@...e.de> wrote:
>
> On Mon, 28 Oct 2019 11:32:07 +0100,
> syzbot wrote:
> >
> > Uninit was stored to memory at:
> >  kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline]
> >  kmsan_internal_chain_origin+0xbd/0x180 mm/kmsan/kmsan.c:319
> >  __msan_chain_origin+0x6b/0xd0 mm/kmsan/kmsan_instr.c:179
> >  parse_term_proc_unit+0x73d/0x7e0 sound/usb/mixer.c:896
> >  __check_input_term+0x13ef/0x2360 sound/usb/mixer.c:989
>
> So this comes from the invalid descriptor for a processing unit, and
> it's very likely the same issue as already spotted -- the validator up
> to 5.3-rc4 had a bug that passed the invalid descriptor falsely.
> This should have been covered by 5.3-rc5, commit ba8bf0967a15 ("ALSA:
> usb-audio: Fix copy&paste error in the validator").

#syz dup: KASAN: slab-out-of-bounds Read in build_audio_procunit