Commit 6c2794a2 authored by Jiri Kosina's avatar Jiri Kosina

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: default avatarRichard Ryniker <ryniker@alum.mit.edu>
Reported-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent a4be0ed3
...@@ -340,7 +340,7 @@ static int hidinput_get_battery_property(struct power_supply *psy, ...@@ -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); struct hid_device *dev = container_of(psy, struct hid_device, battery);
int ret = 0; int ret = 0;
__u8 buf[2] = {}; __u8 *buf;
switch (prop) { switch (prop) {
case POWER_SUPPLY_PROP_PRESENT: case POWER_SUPPLY_PROP_PRESENT:
...@@ -349,12 +349,19 @@ static int hidinput_get_battery_property(struct power_supply *psy, ...@@ -349,12 +349,19 @@ static int hidinput_get_battery_property(struct power_supply *psy,
break; break;
case POWER_SUPPLY_PROP_CAPACITY: 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, ret = dev->hid_get_raw_report(dev, dev->battery_report_id,
buf, sizeof(buf), buf, 2,
dev->battery_report_type); dev->battery_report_type);
if (ret != 2) { if (ret != 2) {
ret = -ENODATA; ret = -ENODATA;
kfree(buf);
break; break;
} }
ret = 0; ret = 0;
...@@ -364,6 +371,7 @@ static int hidinput_get_battery_property(struct power_supply *psy, ...@@ -364,6 +371,7 @@ static int hidinput_get_battery_property(struct power_supply *psy,
buf[1] <= dev->battery_max) buf[1] <= dev->battery_max)
val->intval = (100 * (buf[1] - dev->battery_min)) / val->intval = (100 * (buf[1] - dev->battery_min)) /
(dev->battery_max - dev->battery_min); (dev->battery_max - dev->battery_min);
kfree(buf);
break; break;
case POWER_SUPPLY_PROP_MODEL_NAME: case POWER_SUPPLY_PROP_MODEL_NAME:
......
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