linux-kernel - [PATCH 38/91] ALSA: timer - Fix Oops at closing slave timer

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Message-Id: <20120205220951.077338767@pcw.home.local>
Date:	Sun, 05 Feb 2012 23:10:27 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Takashi Iwai <tiwai@...e.de>, Greg KH <gregkh@...uxfoundation.org>
Subject: [PATCH 38/91] ALSA: timer - Fix Oops at closing slave timer

2.6.27-longterm review patch.  If anyone has any objections, please let us know.

------------------

commit 0584ffa548b6e59aceb027112f23a55f0133400e upstream.

A slave-timer instance has no timer reference, and this results in
NULL-dereference at stopping the timer, typically called at closing
the device.

Reference: https://bugzilla.kernel.org/show_bug.cgi?id=40682

Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 sound/core/timer.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

Index: longterm-2.6.27/sound/core/timer.c
===================================================================
--- longterm-2.6.27.orig/sound/core/timer.c	2012-02-05 22:34:33.866915229 +0100
+++ longterm-2.6.27/sound/core/timer.c	2012-02-05 22:34:40.244919877 +0100
@@ -527,6 +527,8 @@
 	if (err < 0)
 		return err;
 	timer = timeri->timer;
+	if (!timer)
+		return -EINVAL;
 	spin_lock_irqsave(&timer->lock, flags);
 	timeri->cticks = timeri->ticks;
 	timeri->pticks = 0;


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