HID: core: check parameters when sending/receiving data from the device

It is better to check them soon enough before triggering any kernel panic.
Signed-off-by: NBenjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: NDavid Herrmann <dh.herrmann@gmail.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/hid/i2c-hid/i2c-hid.c

@@ -276,7 +276,7 @@ static int i2c_hid_set_or_send_report(struct i2c_client *client, u8 reportType,
 	u16 outputRegister = le16_to_cpu(ihid->hdesc.wOutputRegister);
 	u16 maxOutputLength = le16_to_cpu(ihid->hdesc.wMaxOutputLength);
 
-	/* hidraw already checked that data_len < HID_MAX_BUFFER_SIZE */
+	/* hid_hw_* already checked that data_len < HID_MAX_BUFFER_SIZE */
 	u16 size =	2			/* size */ +
 			(reportID ? 1 : 0)	/* reportID */ +
 			data_len		/* buf */;

include/linux/hid.h

@@ -989,6 +989,9 @@ static inline int hid_hw_raw_request(struct hid_device *hdev,
 				  unsigned char reportnum, __u8 *buf,
 				  size_t len, unsigned char rtype, int reqtype)
 {
+	if (len < 1 || len > HID_MAX_BUFFER_SIZE || !buf)
+		return -EINVAL;
+
 	if (hdev->ll_driver->raw_request)
 		return hdev->ll_driver->raw_request(hdev, reportnum, buf, len,
 						    rtype, reqtype);
@@ -1008,6 +1011,9 @@ static inline int hid_hw_raw_request(struct hid_device *hdev,
 static inline int hid_hw_output_report(struct hid_device *hdev, __u8 *buf,
 					size_t len)
 {
+	if (len < 1 || len > HID_MAX_BUFFER_SIZE || !buf)
+		return -EINVAL;
+
 	if (hdev->ll_driver->output_report)
 		return hdev->ll_driver->output_report(hdev, buf, len);