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regmap: Fix possible ZERO_SIZE_PTR pointer dereferencing error.

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Since we cannot make sure the 'len = pair_size * num_regs' will always
be none zero from the users, and then if 'num_regs' equals to zero by
mistake or other reasons, the kzalloc() will return ZERO_SIZE_PTR, which
equals to ((void *)16).

So this patch fix this with just doing the 'len' 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 2014-04-30 17:31:08 +08:00 committed by Mark Brown
parent c9eaa447e7
commit f5727cd312
1 changed files with 3 additions and 0 deletions
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3
drivers/base/regmap/regmap.c
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@ -1615,6 +1615,9 @@ static int _regmap_raw_multi_reg_write(struct regmap *map,
size_t pair_size = reg_bytes + pad_bytes + val_bytes; size_t pair_size = reg_bytes + pad_bytes + val_bytes;
size_t len = pair_size * num_regs; size_t len = pair_size * num_regs;
if (!len)
return -EINVAL;
buf = kzalloc(len, GFP_KERNEL); buf = kzalloc(len, GFP_KERNEL);
if (!buf) if (!buf)
return -ENOMEM; return -ENOMEM;