linux-kernel - Re: [PATCH v1] ALSA: vx222: fix null-ptr-deref

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Date:   Tue, 07 Sep 2021 07:16:21 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Tong Zhang <ztong0001@...il.com>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Leon Romanovsky <leon@...nel.org>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] ALSA: vx222: fix null-ptr-deref

On Tue, 07 Sep 2021 03:47:45 +0200,
Tong Zhang wrote:
> 
> a recent refactor created a null pointer vx in snd_vx222_probe().
> The vx pointer should have been populated in snd_vx222_create() as
> suggested in earlier version, otherwise vx->core.ibl.size will throw an
> error.
> 
> [    1.298398] BUG: kernel NULL pointer dereference, address: 00000000000001d8
> [    1.316799] RIP: 0010:snd_vx222_probe+0x155/0x290 [snd_vx222]
> 
> Fixes: 3bde3359aa16 ("ALSA: vx222: Allocate resources with device-managed APIs")
> Signed-off-by: Tong Zhang <ztong0001@...il.com>

Thanks, applied.


Takashi