linux-kernel - Re: [v3.2-v3.4 stable version][PATCH 1/2] ring-buffer: Fix NULL pointer if rb_set_head

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Message-ID: <1356623722.17740.0.camel@deadeye.wl.decadent.org.uk>
Date:	Thu, 27 Dec 2012 16:55:22 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, stable <stable@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [v3.2-v3.4 stable version][PATCH 1/2] ring-buffer: Fix NULL
 pointer if rb_set_head_page() fails

On Fri, 2012-11-30 at 11:18 -0500, Steven Rostedt wrote:
> The function rb_set_head_page() searches the list of ring buffer
> pages for a the page that has the HEAD page flag set. If it does
> not find it, it will do a WARN_ON(), disable the ring buffer and
> return NULL, as this should never happen.
> 
> But if this bug happens to happen, not all callers of this function
> can handle a NULL pointer being returned from it. That needs to be
> fixed.
> 
> Cc: stable@...r.kernel.org # 3.0+
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
[...]

Added to the queue for 3.2, thanks.

Ben.

-- 
Ben Hutchings
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