From 6c2794a2984f4c17a58117a68703cc7640f01c5a Mon Sep 17 00:00:00 2001 From: Jiri Kosina Date: Mon, 2 Sep 2013 13:43:00 +0200 Subject: 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 Reported-by: Alan Stern Signed-off-by: Jiri Kosina diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c index 7480799..3fc4034 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: -- cgit v0.10.2