ASoC: core: fix possible ZERO_SIZE_PTR pointer dereferencing error.

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@freescale.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index b87d7d882e6dfb016d08806101996e3659aa11bd..49acc989e4523fd35ef6072ded1295f4b710d930 100644 (file)
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3181,7 +3181,7 @@ 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;