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| author | Jiri Kosina <jkosina@suse.cz> | 2013-09-02 13:43:00 +0200 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2013-09-02 13:43:00 +0200 |
| commit | 6c2794a2984f4c17a58117a68703cc7640f01c5a (patch) | |
| tree | a7bb9e4bf20f644dfb4e28d96b9bcad4b6fbf372 /drivers/hid/hid-input.c | |
| parent | a4be0ed39f2b1ea990804ea54e39bc42d17ed5a5 (diff) | |
| download | lwn-6c2794a2984f4c17a58117a68703cc7640f01c5a.tar.gz lwn-6c2794a2984f4c17a58117a68703cc7640f01c5a.zip | |
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/hid-input.c')
| -rw-r--r-- | drivers/hid/hid-input.c | 12 |
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: |