linux-kernel - [PATCH 3.16 03/26] ASoC: core: fix possible ZERO_SIZE

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Message-Id: <20141007231848.595455581@linuxfoundation.org>
Date:	Tue,  7 Oct 2014 16:19:19 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Xiubo Li <Li.Xiubo@...escale.com>,
	Mark Brown <broonie@...nel.org>
Subject: [PATCH 3.16 03/26] ASoC: core: fix possible ZERO_SIZE_PTR pointer dereferencing error.

3.16-stable review patch.  If anyone has any objections, please let me know.

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

From: Xiubo Li <Li.Xiubo@...escale.com>

commit 6596aa047b624aeec2ea321962cfdecf9953a383 upstream.

Since we cannot make sure the 'params->num_regs' will always be none
zero here, and then if it equals to zero, the kmemdup() will return
ZERO_SIZE_PTR, which equals to ((void *)16).

So this patch fix this with just doing the zero check before calling
kmemdup().

Signed-off-by: Xiubo Li <Li.Xiubo@...escale.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/soc/soc-core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3181,7 +3181,7 @@ int snd_soc_bytes_put(struct snd_kcontro
 	unsigned int val, mask;
 	void *data;
 
-	if (!component->regmap)
+	if (!component->regmap || !params->num_regs)
 		return -EINVAL;
 
 	len = params->num_regs * component->val_bytes;


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