linux-kernel - Re: [PATCH 5.2 03/20] ALSA: usb-audio: Sanity checks for each pipe and EP types

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Message-ID: <20190802134828.GA797@sasha-vm>
Date:   Fri, 2 Aug 2019 09:48:28 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        syzbot+d952e5e28f5fb7718d23@...kaller.appspotmail.com,
        Takashi Iwai <tiwai@...e.de>
Subject: Re: [PATCH 5.2 03/20] ALSA: usb-audio: Sanity checks for each pipe
 and EP types

On Fri, Aug 02, 2019 at 11:39:57AM +0200, Greg Kroah-Hartman wrote:
>From: Takashi Iwai <tiwai@...e.de>
>
>commit 801ebf1043ae7b182588554cc9b9ad3c14bc2ab5 upstream.
>
>The recent USB core code performs sanity checks for the given pipe and
>EP types, and it can be hit by manipulated USB descriptors by syzbot.
>For making syzbot happier, this patch introduces a local helper for a
>sanity check in the driver side and calls it at each place before the
>message handling, so that we can avoid the WARNING splats.
>
>Reported-by: syzbot+d952e5e28f5fb7718d23@...kaller.appspotmail.com
>Signed-off-by: Takashi Iwai <tiwai@...e.de>
>Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

This commit has a fix: 5d78e1c2b7f4b ("ALSA: usb-audio: Fix gpf in
snd_usb_pipe_sanity_check") which was not pulled by Linus yet.

I'm going to drop this commit and re-queue it together with it's fix
once it makes it upstream.

--
Thanks,
Sasha