forked from luck/tmp_suning_uos_patched
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>
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@ -340,7 +340,7 @@ static int hidinput_get_battery_property(struct power_supply *psy,
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{
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struct hid_device *dev = container_of(psy, struct hid_device, battery);
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int ret = 0;
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__u8 buf[2] = {};
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__u8 *buf;
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switch (prop) {
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case POWER_SUPPLY_PROP_PRESENT:
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@ -349,12 +349,19 @@ static int hidinput_get_battery_property(struct power_supply *psy,
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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buf = kmalloc(2 * sizeof(__u8), GFP_KERNEL);
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if (!buf) {
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ret = -ENOMEM;
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break;
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}
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ret = dev->hid_get_raw_report(dev, dev->battery_report_id,
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buf, sizeof(buf),
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buf, 2,
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dev->battery_report_type);
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if (ret != 2) {
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ret = -ENODATA;
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kfree(buf);
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break;
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}
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ret = 0;
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@ -364,6 +371,7 @@ static int hidinput_get_battery_property(struct power_supply *psy,
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buf[1] <= dev->battery_max)
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val->intval = (100 * (buf[1] - dev->battery_min)) /
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(dev->battery_max - dev->battery_min);
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kfree(buf);
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break;
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case POWER_SUPPLY_PROP_MODEL_NAME:
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