[lwip-devel] [bug #67103] IGMP for ipv4 Join Allowed From Invalid States

[zmw]

URL:
  <https://savannah.nongnu.org/bugs/?67103>

                 Summary: IGMP for ipv4 Join Allowed From Invalid States
                   Group: lwIP - A Lightweight TCP/IP stack
               Submitter: zmw12306
               Submitted: Thu 08 May 2025 04:07:51 AM GMT
                Category: IPv4
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: git head


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Follow-up Comments:


-------------------------------------------------------
Date: Thu 08 May 2025 04:07:51 AM GMT By: zmw <zmw12306>
The RFC mandates that 'join group' may occur only in Non-Member state.
However, the implementation only logs a debug message but continues execution
when joining from other states.

 fix="Add state validation and return ERR_VAL if attempting to join from a
non-Non-Member state",
  code_snippet="""
if (group->group_state != IGMP_GROUP_NON_MEMBER) {
    LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup_netif: join to group not in state
IGMP_GROUP_NON_MEMBER\n"));
    return ERR_VAL;  // Add this line to enforce state requirement
}"""








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