[PATCH] ASoC: core: fix possible ZERO_SIZE_PTR pointer dereferencing error.

[Xiubo Li]

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 <***@freescale.com>
---
sound/soc/soc-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 7b5a7ce..263514a 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3051,7 +3051,7 @@ 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;

[Mark Brown]

Post by Xiubo Li
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).

Applied, thanks.