[lwip-devel] [bug #55513] Uninitialized variable in struct netconn

[Dirk Ziegelmeier]

URL:
  <https://savannah.nongnu.org/bugs/?55513>

                 Summary: Uninitialized variable in struct netconn
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: dziegel
            Submitted on: Fri 18 Jan 2019 07:49:42 PM UTC
                Category: sockets/netconn
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: git head

    _______________________________________________________

Details:

Reported via email:

Karol Domagalski address@hidden via srs2.kundenserver.de 
        
5:04 PM (3 hours ago)
        
to lwip-devel

Dear LwIP developers

My program stucks in busy loop in the netconn_mark_mbox_invalid function (in
the src/api/api_msg.c file). This is because conn->mbox_threads_waiting is set
to random value. This problem only appears if MEMP_MEM_MALLOC is set 1 (in
lwipopts.h file).

As I can see conn->mbox_threads_waiting is never initiated to known value.
After adding this in the netconn_alloc function :
#if LWIP_NETCONN_FULLDUPLEX
  conn->mbox_threads_waiting = 0;
#endif
Problem seems to be solved.

The problem does not appear when MEMP_MEM_MALLOC is set to 0 because the
memory pools are used instead of the heap. Typically, each system sets these
pools to zero during startup.

Regards

-- 
Karol Domagalski




    _______________________________________________________

Reply to this item at:

  <https://savannah.nongnu.org/bugs/?55513>

_______________________________________________
  Message sent via Savannah
  https://savannah.nongnu.org/