linux-kernel - Re: [PATCH] media: au0828: Convert BUG_ON to WARN

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAGoCfixO1mUO0VGBL9GzOmaWpQ6rVos095reFfUWnVwCj0CyYg@mail.gmail.com>
Date:	Sun, 8 Apr 2012 21:46:28 -0400
From:	Devin Heitmueller <dheitmueller@...nellabs.com>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Hans Verkuil <hans.verkuil@...co.com>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	jrh <jharbestonus@...il.com>
Subject: Re: [PATCH] media: au0828: Convert BUG_ON to WARN_ONCE

On Sun, Apr 8, 2012 at 7:19 PM, Larry Finger <Larry.Finger@...inger.net> wrote:
> In the mail thread at http://www.mythtv.org/pipermail/mythtv-users/2012-April/331164.html,
> a kernel crash is triggered when trying to run mythtv with a HVR950Q tuner.
> The crash condition is due to res_free() being called to free something that
> has is not reserved. The actual reason for this mismatch of reserve/free is
> not known; however, using a BUG_ON rather than a WARN_ON seems unfortunate.

This patch should be nack'd.  The real reason should be identified,
and a patch should be submitted for that (and from what I gather, it
seems like it is easily reproduced by the submitter).  Just add a few
"dump_stack()" calls in the res_get() and res_free() calls to identify
the failing call path.

Devin

-- 
Devin J. Heitmueller - Kernel Labs
http://www.kernellabs.com
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/