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[lwip-devel] [bug #27454] udp_input() source address save method cause r


From: hanhui
Subject: [lwip-devel] [bug #27454] udp_input() source address save method cause recvfrom() source address error
Date: Tue, 15 Sep 2009 06:27:51 +0000
User-agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; .NET CLR 1.1.4322; MEGAUPLOAD 2.0)

URL:
  <http://savannah.nongnu.org/bugs/?27454>

                 Summary: udp_input() source address save method cause
recvfrom() source address error
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: hanhui03
            Submitted on: Tue Sep 15 06:27:50 2009
                Category: UDP
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: CVS Head

    _______________________________________________________

Details:

udp_input() use a local variable to save source address, and then post this
variable's address into message box. if user thread priority lower than tcpip
thread(), when udp_input() return, the local variable will be changed. then
user netconn_recv() thread get this source address is error.

--------CODE-----------
if (pcb->recv != NULL) {
        /* copy the source address to make it independent of the pbuf */
        struct ip_addr src_addr = iphdr->src;
        /* now the recv function is responsible for freeing p */
        pcb->recv(pcb->recv_arg, pcb, p, &src_addr, src);
      }
--------CODE-----------






    _______________________________________________________

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  <http://savannah.nongnu.org/bugs/?27454>

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