[lwip-devel] [bug #39124] fragmented ICMP output corrupted by IGMP input

[beaujouan]

URL:
  <http://savannah.nongnu.org/bugs/?39124>

                 Summary: fragmented ICMP output corrupted by IGMP input
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: rico37
            Submitted on: jeu. 30 mai 2013 13:52:08 GMT
                Category: IPv4
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: 1.3.1

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Details:

Hello,

I am new to savannah, hoping I post in the right place.

First, bug reports to lwIP 1.3.2 but it was not listed in lwIP version list,
so I selected 1.3.1.

The bug is, when lwIP send a fragmented ICMP Echo reply, this output frame can
be corrupted by an IGMP incoming request.

I have seen the bug #35616 report which seems to be very similar but does not
concern lwIP 1.3.2.

According to this bug, in my configuration, ETH_PAD_SIZE = 2 and
MEM_ALIGNMENT=4, so I am not sure that issue is the same as in the bug #35616

I think there may be a freeing issue, allowing pbuf used in output frame to be
used when receiving the IGMP incoming frame but I am a little bit lost in the
pbuf mecanism.

Is there a known fix I did not catch ?
Is there some other information that can I provide to help understanding ?

Regards,





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