[lwip-devel] [bug #63938] On apprupt tcp interrupten the pcb->next list points to itself

[Maximilian Mayr]

URL:
  <https://savannah.nongnu.org/bugs/?63938>

                 Summary: On apprupt tcp interrupten the pcb->next list points
to itself
                   Group: lwIP - A Lightweight TCP/IP stack
               Submitter: mmay
               Submitted: Fri 17 Mar 2023 01:28:41 PM UTC
                Category: IPv4
                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: 2.1.3


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Follow-up Comments:


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Date: Fri 17 Mar 2023 01:28:41 PM UTC By: Maximilian Mayr <mmay>
When stopping an active ipv4/tcp connection via "hard stop" in our case
Qt-Application debelopment crash. The pcb list can be corrupt when the next
connection starts.

This happens in file tcp_in.c at line 271.
prev->next = pcb->next;

the list can point directly to itself or over a few elements.
I attach my configuration. And a few screenshots of the environment at the
error.

This happens always and is easily reproduceable.






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File Attachments:


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Date: Fri 17 Mar 2023 01:28:41 PM UTC  Name: lwipopts.h  Size: 3KiB   By: mmay

<http://savannah.nongnu.org/bugs/download.php?file_id=54501>
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Date: Fri 17 Mar 2023 01:28:41 PM UTC  Name: Unbenannt.PNG  Size: 7KiB   By:
mmay

<http://savannah.nongnu.org/bugs/download.php?file_id=54502>
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Date: Fri 17 Mar 2023 01:28:41 PM UTC  Name: Unbenannt1.PNG  Size: 52KiB   By:
mmay

<http://savannah.nongnu.org/bugs/download.php?file_id=54503>

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