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media: mceusb: sanity check for prescaler value
prescaler larger than 8 would mean the carrier is at most 152Hz, which does not make sense for IR carriers. Reported-by: syzbot+6d31bf169a8265204b8d@syzkaller.appspotmail.com Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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@ -701,11 +701,18 @@ static void mceusb_dev_printdata(struct mceusb_dev *ir, u8 *buf, int buf_len,
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data[0], data[1]);
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break;
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case MCE_RSP_EQIRCFS:
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if (!data[0] && !data[1]) {
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dev_dbg(dev, "%s: no carrier", inout);
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break;
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}
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// prescaler should make sense
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if (data[0] > 8)
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break;
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period = DIV_ROUND_CLOSEST((1U << data[0] * 2) *
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(data[1] + 1), 10);
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if (!period)
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break;
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carrier = (1000 * 1000) / period;
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carrier = USEC_PER_SEC / period;
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dev_dbg(dev, "%s carrier of %u Hz (period %uus)",
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inout, carrier, period);
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break;
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