3.8.13.10 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Jiri Kosina <jkosina@xxxxxxx>
commit 6c2794a2984f4c17a58117a68703cc7640f01c5a upstream.
Instead of using data from stack for DMA in hidinput_get_battery_property(),
allocate the buffer dynamically.
Reported-by: Richard Ryniker <ryniker@xxxxxxxxxxxx>
Reported-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
[ kamal: backport to 3.8 (context) ]
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
drivers/hid/hid-input.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 21b196c..f495ada 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -340,7 +340,7 @@ static int hidinput_get_battery_property(struct power_supply *psy,
{
struct hid_device *dev = container_of(psy, struct hid_device, battery);
int ret = 0;
- __u8 buf[2] = {};
+ __u8 *buf;
switch (prop) {
case POWER_SUPPLY_PROP_PRESENT:
@@ -349,13 +349,19 @@ static int hidinput_get_battery_property(struct power_supply *psy,
break;
case POWER_SUPPLY_PROP_CAPACITY:
+
+ buf = kmalloc(2 * sizeof(__u8), GFP_KERNEL);
+ if (!buf) {
+ ret = -ENOMEM;
+ break;
+ }
ret = dev->hid_get_raw_report(dev, dev->battery_report_id,
- buf, sizeof(buf),
+ buf, 2,
dev->battery_report_type);
if (ret != 2) {
- if (ret >= 0)
- ret = -EINVAL;
+ ret = -ENODATA;
+ kfree(buf);
break;
}
@@ -364,6 +370,7 @@ static int hidinput_get_battery_property(struct power_supply *psy,
buf[1] <= dev->battery_max)
val->intval = (100 * (buf[1] - dev->battery_min)) /
(dev->battery_max - dev->battery_min);
+ kfree(buf);
break;
case POWER_SUPPLY_PROP_MODEL_NAME:
--
1.8.1.2
--
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