A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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regmap: fix possible ZERO_SIZE_PTR pointer dereferencing error.

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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 <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
Cc: [email protected]
This commit is contained in:
Xiubo Li 2014-09-28 17:09:54 +08:00 • committed by Mark Brown
commit d6b41cb060
1 changed files with 3 additions and 0 deletions
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3
drivers/base/regmap/regmap.c
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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");