media: mceusb: filter out bogus timing irdata of duration 0

A mceusb device has been observed producing invalid irdata. Proactively
guard against this.

Suggested-by: Matthias Reichl <hias@horus.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/rc/mceusb.c

@@ -1177,6 +1177,11 @@ static void mceusb_process_ir_data(struct mceusb_dev *ir, int buf_len)
 			init_ir_raw_event(&rawir);
 			rawir.pulse = ((ir->buf_in[i] & MCE_PULSE_BIT) != 0);
 			rawir.duration = (ir->buf_in[i] & MCE_PULSE_MASK);
+			if (unlikely(!rawir.duration)) {
+				dev_warn(ir->dev, "nonsensical irdata %02x with duration 0",
+					 ir->buf_in[i]);
+				break;
+			}
 			if (rawir.pulse) {
 				ir->pulse_tunit += rawir.duration;
 				ir->pulse_count++;