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[lwip-devel] [bug #59033] Possible memory leak in mqtt_disconnect

From: Ondrej Lufinka
Subject: [lwip-devel] [bug #59033] Possible memory leak in mqtt_disconnect
Date: Fri, 28 Aug 2020 09:13:00 -0400 (EDT)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36


                 Summary: Possible memory leak in mqtt_disconnect
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: ondrej_lufinka
            Submitted on: Fri 28 Aug 2020 01:12:59 PM UTC
                Category: Platform ports
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: git head



I use LwIP on STM32 MCU. I have a working combination of LwIP + MbedTLS +
MQTT. I found a possible memory leak in function mqtt_disconnect. The PCB:


used for connection is never released.

When I added the line

tcp_abandon((struct tcp_pcb *)client->conn->inner_conn->state, 0);

to the mqtt_disconnect function, the memory leak is gone.


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