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gnrc_tcp: add minimum length check to _receive

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This commit is contained in:
Sören Tempel 2019-08-26 13:05:20 +02:00
parent 97de3e835b
commit 0fff1b35ec
1 changed files with 6 additions and 0 deletions
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6
sys/net/gnrc/transport_layer/tcp/gnrc_tcp_eventloop.c
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@ -136,6 +136,12 @@ static int _receive(gnrc_pktsnip_t *pkt)
return 0;
}
if (tcp->size < sizeof(tcp_hdr_t)) {
DEBUG("gnrc_tcp_eventloop.c : _receive() : packet is too short\n");
gnrc_pktbuf_release(pkt);
return -ERANGE;
}
/* Extract control bits, src and dst ports and check if SYN is set (not SYN+ACK) */
hdr = (tcp_hdr_t *)tcp->data;
ctl = byteorder_ntohs(hdr->off_ctl);