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| author | Xiubo Li <Li.Xiubo@freescale.com> | 2014-04-30 17:31:08 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-04-30 20:33:57 -0700 |
| commit | f5727cd31283aa478f7f9396c6eb7b5aceebb869 (patch) | |
| tree | db763dd8418489159f01bb5397d7895df81ca610 /drivers/base | |
| parent | c9eaa447e77efe77b7fa4c953bd62de8297fd6c5 (diff) | |
| download | linux-f5727cd31283aa478f7f9396c6eb7b5aceebb869.tar.gz linux-f5727cd31283aa478f7f9396c6eb7b5aceebb869.tar.bz2 linux-f5727cd31283aa478f7f9396c6eb7b5aceebb869.zip | |
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>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/regmap/regmap.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 63e30ef096e2..9596f3048939 100644 --- 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; |