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Validate ip length before using tcp header. #319

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Validate ip length before using tcp header. #319

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4 changes: 4 additions & 0 deletions mtcp/src/tcp_in.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1205,6 +1205,10 @@ int
ProcessTCPPacket(mtcp_manager_t mtcp,
uint32_t cur_ts, const int ifidx, const struct iphdr *iph, int ip_len)
{
if (ip_len < (iph->ihl << 2) + sizeof(struct tcphdr)) {
TRACE_DBG("Invalid IP header length\n");
return ERROR;
}
struct tcphdr* tcph = (struct tcphdr *) ((u_char *)iph + (iph->ihl << 2));
uint8_t *payload = (uint8_t *)tcph + (tcph->doff << 2);
int payloadlen = ip_len - (payload - (u_char *)iph);
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