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@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 63e30ef096e2be5e16a1e989bba22dd3b6c69f8d..9596f3048939dbc682b509c28717a0c152930dde 100644 (file)
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -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 len = pair_size * num_regs;
 
+       if (!len)
+               return -EINVAL;
+
        buf = kzalloc(len, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;