linux-kernel - [RFC PATCH 11/13] sound: atmel-pcm-dma: check pointer before dereference

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Message-Id: <1372667978-4718-12-git-send-email-richard.genoud@gmail.com>
Date:	Mon,  1 Jul 2013 10:39:36 +0200
From:	Richard Genoud <richard.genoud@...il.com>
To:	devicetree-discuss@...ts.ozlabs.org
Cc:	linux-arm-kernel@...ts.infradead.org,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, linux-kernel@...r.kernel.org,
	Richard Genoud <richard.genoud@...il.com>
Subject: [RFC PATCH 11/13] sound: atmel-pcm-dma: check pointer before dereference

If platform_data is NULL, filter() is called with a NULL slave
parameter.

Signed-off-by: Richard Genoud <richard.genoud@...il.com>
---
 sound/soc/atmel/atmel-pcm-dma.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/atmel/atmel-pcm-dma.c b/sound/soc/atmel/atmel-pcm-dma.c
index 1d38fd0..b20dbba 100644
--- a/sound/soc/atmel/atmel-pcm-dma.c
+++ b/sound/soc/atmel/atmel-pcm-dma.c
@@ -96,6 +96,9 @@ static bool filter(struct dma_chan *chan, void *slave)
 {
 	struct at_dma_slave *sl = slave;
 
+	if (!sl)
+		return false;
+
 	if (sl->dma_dev == chan->device->dev) {
 		chan->private = sl;
 		return true;
-- 
1.7.10.4

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