[lwip-devel] [bug #55607] MQTT assert when length of received message > MQTT_VAR_HEADER_BUFFER_LEN

[David GIRAULT]

URL:
  <https://savannah.nongnu.org/bugs/?55607>

                 Summary: MQTT assert when length of received message >
MQTT_VAR_HEADER_BUFFER_LEN
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: dgirault
            Submitted on: mer. 30 janv. 2019 10:16:41 UTC
                Category: apps
                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: git head

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Details:

The following assert in mqtt.c line 684, added by commit
eea95459c9b0f150e9b9ab24e80e27e09c2612e5, completely broke MQTT reception.

LWIP_ASSERT("client->msg_idx < MQTT_VAR_HEADER_BUFFER_LEN", client->msg_idx <
MQTT_VAR_HEADER_BUFFER_LEN);


MQTT had always the ability to receive message longer than
MQTT_VAR_HEADER_BUFFER_LEN. Receive callback is called many times.






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