linux-kernel - Re: Oops in sound/usb/pcm.c:match_endpoint

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Date:	Fri, 11 Jan 2013 08:47:25 +0100
From:	Jens Axboe <axboe@...nel.dk>
To:	Takashi Iwai <tiwai@...e.de>
CC:	Eldad Zack <eldad@...refinery.com>, perex@...ex.cz,
	alsa-devel@...a-project.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Oops in sound/usb/pcm.c:match_endpoint_audioformats() in current
 -git

On 2013-01-10 21:19, Takashi Iwai wrote:
> From: Takashi Iwai <tiwai@...e.de>
> Subject: [PATCH v2] ALSA: usb-audio: Fix NULL dereference by access to
>  non-existing substream
> 
> The commit [0d9741c0: ALSA: usb-audio: sync ep init fix for
> audioformat mismatch] introduced the correction of parameters to be
> set for sync EP.  But since the new code assumes that the sync EP is
> always paired with the data EP of another direction, it triggers Oops
> when a device only with a single direction is used.
> 
> This patch adds a proper check of sync EP type and the presence of the
> paired substream for avoiding the crash.
> 
> Reported-by: Jens Axboe <axboe@...nel.dk>
> Signed-off-by: Takashi Iwai <tiwai@...e.de>

Confirmed, it works. You can add my tested-by too. Thanks Takashi!

-- 
Jens Axboe

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