p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

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
This commit is contained in:
Xiubo Li 2014-09-28 17:09:54 +08:00 committed by Mark Brown
parent 5336be8416
commit d6b41cb060
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/base/regmap/regmap.c
View File

@ -1659,6 +1659,9 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
} 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");