char: pcmcia: error out if 'num_bytes_read' is greater than 4 in set_protocol()
Theoretically, it will cause index out of bounds error if
'num_bytes_read' is greater than 4. As we expect it(and was tested)
never to be greater than 4, error out if it happens.
Fixes: c1986ee9be
("[PATCH] New Omnikey Cardman 4000 driver")
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20210521120617.138396-1-yukuai3@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -544,6 +544,10 @@ static int set_protocol(struct cm4000_dev *dev, struct ptsreq *ptsreq)
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io_read_num_rec_bytes(iobase, &num_bytes_read);
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if (num_bytes_read >= 4) {
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DEBUGP(2, dev, "NumRecBytes = %i\n", num_bytes_read);
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if (num_bytes_read > 4) {
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rc = -EIO;
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goto exit_setprotocol;
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}
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break;
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}
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usleep_range(10000, 11000);
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