regmap: fix possible ZERO_SIZE_PTR pointer dereferencing error.

Since we cannot make sure the 'val_count' 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
This commit is contained in:
Xiubo Li 2014-09-28 17:09:54 +08:00 коммит произвёл Mark Brown
Родитель 5336be8416
Коммит d6b41cb060
1 изменённых файлов: 3 добавлений и 0 удалений

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@ -1659,6 +1659,9 @@ out:
} else {
void *wval;
if (!val_count)
return -EINVAL;
wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL);
if (!wval) {
dev_err(map->dev, "Error in memory allocation\n");