linux-kernel - [PATCH] ASoC: correct the check for NULL dma

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Date:	Fri, 31 Aug 2012 08:55:21 +0530
From:	Prasad Joshi <prasadjoshi.linux@...il.com>
To:	prasadjoshi.linux@...il.com
Cc:	lrg@...com, broonie@...nsource.wolfsonmicro.com, perex@...ex.cz,
	tiwai@...e.de, rajeev-dlh.kumar@...com,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ASoC: correct the check for NULL dma_buffer pointer

The if condition
	if (!buf && !buf->area)

checks if the buf pointer is NULL and then dereferences it again to
check if the buffer area is NULL, resulting in possible NULL
dereference.

Signed-off-by: Prasad Joshi <prasadjoshi.linux@...il.com>
---
 sound/soc/spear/spear_pcm.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/sound/soc/spear/spear_pcm.c b/sound/soc/spear/spear_pcm.c
index 97c2cac..8c7f237 100644
--- a/sound/soc/spear/spear_pcm.c
+++ b/sound/soc/spear/spear_pcm.c
@@ -138,7 +138,7 @@ static void spear_pcm_free(struct snd_pcm *pcm)
 			continue;
 
 		buf = &substream->dma_buffer;
-		if (!buf && !buf->area)
+		if (!buf || !buf->area)
 			continue;
 
 		dma_free_writecombine(pcm->card->dev, buf->bytes,
-- 
1.7.5.4

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