From: Xiubo Li <Li.Xiubo@xxxxxxxxxxxxx>
3.4.106-rc1 review patch. If anyone has any objections, please let me know.
------------------
commit d6b41cb06044a7d895db82bdd54f6e4219970510 upstream.
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@xxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
[lizf: Backported to 3.4: release mutex before returning EINVAL]
Signed-off-by: Zefan Li <lizefan@xxxxxxxxxx>
---
drivers/base/regmap/regmap.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index e554542..8e81f85 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -600,6 +600,11 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
if (val_bytes == 1) {
wval = (void *)val;
} else {
+ if (!val_count) {
+ ret = -EINVAL;
+ goto out;
+ }
+
wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL);
if (!wval) {
ret = -ENOMEM;
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html