ASoC: core: fix possible ZERO_SIZE_PTR pointer dereferencing error.

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@freescale.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index d4bfd4a9076fe02fd50495e0fee6f97471500bb5..ae48f1013e8093bbf359a831ae8e48e837a6dfa1 100644 (file)
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3203,7 +3203,7 @@ int snd_soc_bytes_put(struct snd_kcontrol *kcontrol,
        unsigned int val, mask;
        void *data;
 
-       if (!component->regmap)
+       if (!component->regmap || !params->num_regs)
                return -EINVAL;
 
        len = params->num_regs * component->val_bytes;