tree 0c655c9d5a9f7966560b53ce78427affff51071e
parent 939d9f16994166156fa3d6dfece9c46b92e368e0
author Xiubo Li <Li.Xiubo@freescale.com> 1393555699 +0800
committer Mark Brown <broonie@linaro.org> 1393907539 +0800

ASoC: cache: Do the codec->reg_cache zero pionter check

For the snd_soc_cache_init(), the reg_size maybe zero and then the value
of codec->reg_cache, which is alloced via kzalloc, maybe equal to
ZERO_SIZE_PTR. If the reg parameter of snd_soc_cache_write() is large enough,
the cache[idx] = val maybe cause the kernel crash...

So this patch fix this via doing the zero pionter check of it.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>