[lwip-devel] [bug #43081] The crash error for the active LWIP_NETBUF_RECVINFO option in api_msg.c (lwip-1.4.1)

[Joel Cunningham]

Follow-up Comment #1, bug #43081 (project lwip):

I've come across the same behavior and I think the fix is slightly different:

IPH_LEN is the total number of bytes of the IP header + payload.  This would
be the entire IP packet (including the datagram).  To get the length (in
bytes) of the IP header, we need IPH_HL * 4

So it should be

const struct udp_hdr* udphdr = (void*)(((char*)iphdr) + (IPH_HL(iphdr) * 4));

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