[lwip-devel] [bug #56487] [v2.1.2] crash when TCP continuous write encounter wifi disconnect

[Song Pu]

URL:
  <https://savannah.nongnu.org/bugs/?56487>

                 Summary: [v2.1.2] crash when TCP continuous write  encounter
wifi disconnect
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: pusong666
            Submitted on: Thu 13 Jun 2019 08:19:56 AM UTC
                Category: sockets/netconn
                Severity: 3 - Normal
              Item Group: Crash Error
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: 2.1.1

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Details:

reproduce ratio:
seldom

lwip option:
enable socket etc.
enable LWIP_TCPIP_CORE_LOCKING

reproduce step:
1. TCP Socket write large data continuously
2. disconnect wifi， then our code will handle "wifi_disconnect" event to
netif_set_addr(sta_if, IP4_ADDR_ANY, IP4_ADDR_ANY, IP4_ADDR_ANY)

result:
crash due to conn->pcb or conn->current_msg == NULL in
lwip_netconn_do_writemore






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