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ASoC: cache: Fix possible ZERO_SIZE_PTR pointer dereferencing error. 

Since we cannot make sure the 'reg_size' will always be none zero here,
and then if 'reg_size' equals to zero, the kzalloc() will return ZERO_SIZE_PTR,
which equals to ((void *)16).

So this patch fix this with just doing the 'reg_size' zero check before calling
kzalloc().

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Xiubo Li 2014-05-19 16:32:09 +08:00 committed by Mark Brown
parent 24089e04cb
commit b59dce53ef
1 changed files with 3 additions and 0 deletions
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3
sound/soc/soc-cache.c
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@ -72,6 +72,9 @@ int snd_soc_cache_init(struct snd_soc_codec *codec)
reg_size = codec_drv->reg_cache_size * codec_drv->reg_word_size; reg_size = codec_drv->reg_cache_size * codec_drv->reg_word_size;
if (!reg_size)
return -EINVAL;
mutex_init(&codec->cache_rw_mutex); mutex_init(&codec->cache_rw_mutex);
dev_dbg(codec->dev, "ASoC: Initializing cache for %s codec\n", dev_dbg(codec->dev, "ASoC: Initializing cache for %s codec\n",