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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>
This commit is contained in:
Sean Young 2018-05-10 07:37:51 -04:00 committed by Mauro Carvalho Chehab
parent aec3eadfb6
commit d4589935eb
1 changed files with 5 additions and 0 deletions
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5
drivers/media/rc/mceusb.c
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@ -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++;