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[lwip-devel] [bug #43081] The crash error for the active LWIP_NETBUF_REC
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From: |
Przemyslaw Bejtan |
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Subject: |
[lwip-devel] [bug #43081] The crash error for the active LWIP_NETBUF_RECVINFO option in api_msg.c (lwip-1.4.1) |
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Date: |
Wed, 27 Aug 2014 06:38:12 +0000 |
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User-agent: |
Mozilla/5.0 (Windows NT 5.1; rv:31.0) Gecko/20100101 Firefox/31.0 |
Follow-up Comment #2, bug #43081 (project lwip):
Yes, you are right. Analyzing deeper original line 184, we can see the
additional mistake. The calculation formula of “*udphdr” address is
incorrect, because “IPH_LEN(iphdr)” refers to the length of entire IP
package, but it should refer only to the header length of this package. Your
solution is OK, but to be precise, it should be:
const struct udp_hdr* udphdr = (void*)(((char*)iphdr) + (IPH_HL(iphdr) * 4));
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