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PPP, don't assert if we receive a too short packet in ppp_input(), just drop

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We might actually receive too short packets through PPPoE or PPPoL2TP,
don't assert on unusal packets, just drop them.
This commit is contained in:
Sylvain Rochet 2015-04-22 00:31:14 +02:00
parent 5989c1883e
commit 15cc47334e
1 changed files with 6 additions and 8 deletions
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14
src/netif/ppp/ppp.c
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@ -712,16 +712,17 @@ void ppp_input(ppp_pcb *pcb, struct pbuf *pb) {
const char *pname;
#endif /* PPP_DEBUG && PPP_PROTOCOLNAME */
if (pb->len < 2) {
PPPDEBUG(LOG_ERR, ("ppp_input[%d]: packet too short\n", pcb->netif->num));
goto drop;
}
protocol = (((u8_t *)pb->payload)[0] << 8) | ((u8_t*)pb->payload)[1];
#if PRINTPKT_SUPPORT
ppp_dump_packet("rcvd", (unsigned char *)pb->payload, pb->len);
#endif /* PRINTPKT_SUPPORT */
if(pbuf_header(pb, -(s16_t)sizeof(protocol))) {
LWIP_ASSERT("pbuf_header failed\n", 0);
goto drop;
}
pbuf_header(pb, -(s16_t)sizeof(protocol));
LINK_STATS_INC(link.recv);
snmp_inc_ifinucastpkts(pcb->netif);
@ -901,10 +902,7 @@ void ppp_input(ppp_pcb *pcb, struct pbuf *pb) {
#endif /* PPP_PROTOCOLNAME */
ppp_warn("Unsupported protocol 0x%x received", protocol);
#endif /* PPP_DEBUG */
if (pbuf_header(pb, (s16_t)sizeof(protocol))) {
LWIP_ASSERT("pbuf_header failed\n", 0);
goto drop;
}
pbuf_header(pb, (s16_t)sizeof(protocol));
lcp_sprotrej(pcb, (u8_t*)pb->payload, pb->len);
}
break;