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drivers/slipdev: fix off-by-one error in _recv()

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This commit is contained in:
Benjamin Valentin 2022-10-31 22:54:33 +01:00
parent d704a1a805
commit 269b3c97c2
1 changed files with 7 additions and 4 deletions
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11
drivers/slipdev/slipdev.c
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@ -201,16 +201,19 @@ static int _recv(netdev_t *netdev, void *buf, size_t len, void *info)
/* something went wrong, return error */
return -EIO;
}
tmp = slipdev_unstuff_readbyte(ptr, byte, &escaped);
ptr += tmp;
res += tmp;
if ((unsigned)res > len) {
/* frame is larger than expected - lost end marker */
if ((unsigned)res >= len) {
while (byte != SLIPDEV_END) {
/* clear out unreceived packet */
byte = tsrb_get_one(&dev->inbuf);
}
return -ENOBUFS;
}
tmp = slipdev_unstuff_readbyte(ptr, byte, &escaped);
ptr += tmp;
res += tmp;
} while (byte != SLIPDEV_END);
if (++dev->rx_done != dev->rx_queued) {