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authorJiri Kosina <jkosina@suse.cz>2013-09-02 15:43:00 +0400
committerJiri Kosina <jkosina@suse.cz>2013-09-02 15:43:00 +0400
commit6c2794a2984f4c17a58117a68703cc7640f01c5a (patch)
treea7bb9e4bf20f644dfb4e28d96b9bcad4b6fbf372 /drivers/hid
parenta4be0ed39f2b1ea990804ea54e39bc42d17ed5a5 (diff)
downloadlinux-6c2794a2984f4c17a58117a68703cc7640f01c5a.tar.xz
HID: battery: don't do DMA from stack
Instead of using data from stack for DMA in hidinput_get_battery_property(), allocate the buffer dynamically. Cc: stable@kernel.org Reported-by: Richard Ryniker <ryniker@alum.mit.edu> Reported-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/hid-input.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 7480799e535c..3fc4034a4367 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:
@@ -349,12 +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) {
ret = -ENODATA;
+ kfree(buf);
break;
}
ret = 0;
@@ -364,6 +371,7 @@ 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: