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| author | Xiubo Li <Li.Xiubo@freescale.com> | 2014-09-28 17:09:54 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2014-09-28 11:55:07 +0100 |
| commit | d6b41cb06044a7d895db82bdd54f6e4219970510 (patch) | |
| tree | a3dc551bd4d54b98fc4cf58b2f90cba92aeef63c /drivers/base | |
| parent | 5336be8416a71b5568d2cf54a2f2066abe9f2a53 (diff) | |
| download | linux-d6b41cb06044a7d895db82bdd54f6e4219970510.tar.gz linux-d6b41cb06044a7d895db82bdd54f6e4219970510.tar.bz2 linux-d6b41cb06044a7d895db82bdd54f6e4219970510.zip | |
regmap: fix possible ZERO_SIZE_PTR pointer dereferencing error.
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 <Li.Xiubo@freescale.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.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 b903aff59af3..e677a1b79f95 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -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"); |