[lwip-devel] [bug #49578] lwip_socket_drop_registered_memberships API may not work with LWIP_SOCKET_OFFSET

[Arpit Agarwal]

URL:
  <http://savannah.nongnu.org/bugs/?49578>

                 Summary: lwip_socket_drop_registered_memberships API may not
work with LWIP_SOCKET_OFFSET
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: arpit_iitg
            Submitted on: Fri 11 Nov 2016 10:06:40 AM GMT
                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

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Details:

The API directly tries to use sockets array to leave multicast group.

Reference Code Line:

netconn_join_leave_group(sockets[s].conn, &multi_addr, &if_addr,
NETCONN_LEAVE);

So in case LWIP_SOCKET_OFFSET is in use, this will not work.

It can be easily fixed using below code:

netconn_join_leave_group(sock.conn, &multi_addr, &if_addr, NETCONN_LEAVE);

as we already have socket corresponding to socket descriptor passed in
argument. 





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