From: Kees Cook <[email protected]> This driver must validate the availability of the HID output report and its size before it can write LED states via buzz_set_leds(). This stops a heap overflow that is possible if a device provides a malicious HID output report:
[ 108.171280] usb 1-1: New USB device found, idVendor=054c, idProduct=0002 ... [ 117.507877] BUG kmalloc-192 (Not tainted): Redzone overwritten CVE-2013-2890 Signed-off-by: Kees Cook <[email protected]> Cc: [email protected] Reviewed-by: Benjamin Tissoires <[email protected]> --- v3: - no changes drivers/hid/hid-sony.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c index 30dbb6b..b18320d 100644 --- a/drivers/hid/hid-sony.c +++ b/drivers/hid/hid-sony.c @@ -537,6 +537,10 @@ static int buzz_init(struct hid_device *hdev) drv_data = hid_get_drvdata(hdev); BUG_ON(!(drv_data->quirks & BUZZ_CONTROLLER)); + /* Validate expected report characteristics. */ + if (!hid_validate_values(hdev, HID_OUTPUT_REPORT, 0, 0, 7)) + return -ENODEV; + buzz = kzalloc(sizeof(*buzz), GFP_KERNEL); if (!buzz) { hid_err(hdev, "Insufficient memory, cannot allocate driver data\n"); -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
