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Date: Wed, 30 Apr 2014 17:31:08 +0800 From: Xiubo Li <Li.Xiubo@...escale.com> To: <broonie@...nel.org> CC: <linux-kernel@...r.kernel.org>, Xiubo Li <Li.Xiubo@...escale.com> Subject: [PATCH] regmap: Fix possible ZERO_SIZE_PTR pointer dereferencing error. 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@...escale.com> --- drivers/base/regmap/regmap.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 18d193f..4ef7a24 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -1685,6 +1685,9 @@ static int _regmap_raw_multi_reg_write(struct regmap *map, size_t pair_size = reg_bytes + pad_bytes + val_bytes; size_t len = pair_size * num_regs; + if (!len) + return -EINVAL; + buf = kzalloc(len, GFP_KERNEL); if (!buf) return -ENOMEM; -- 1.8.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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