buglwIP - A Lightweight TCP/IP stack - Bugs: bug #59032, Possible memory leak


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bug #59032: Possible memory leak

Submitted by:  Ondrej Lufinka <ondrej_lufinka>
Submitted on:  Fri 28 Aug 2020 01:09:03 PM UTC  
Category:  Platform ports Severity:  3 - Normal
Item Group:  Faulty Behaviour Status:  Fixed
Privacy:  Public Assigned to:  Erik Ekman <yarrick>
Open/Closed:  Closed Planned Release:  None
lwIP version:  git head

Wed 13 Jan 2021 09:22:09 PM UTC, comment #2: 

I have fixed this like you suggested David:


I have not been able to test it, let me know if there are any problems.

Erik Ekman <yarrick>
Project MemberIn charge of this item.
Fri 18 Sep 2020 12:32:10 PM UTC, comment #1: 

Hi Ondrej,

It seems there is a missing call to mbedtls_ssl_config_free(&conf->conf); in altcp_tls_free_config() before altcp_mbedtls_free_config(conf);

Nice finding!


David GIRAULT <dgirault>
Fri 28 Aug 2020 01:09:03 PM UTC, original submission:  

I use LwIP on STM32 MCU. I have a working combination of LwIP + MbedTLS + MQTT. I found a possible memory leak in function altcp_tls_create_config_client_2wayauth. Inside the function mbedtls_ssl_conf_own_cert there is line:

new_cert = mbedtls_calloc( 1, sizeof( mbedtls_ssl_key_cert ) );

which allocates new memory. This memory is never released. When I added line:


to the altcp_tls_free_config function, the memory leak is gone.

Ondrej Lufinka <ondrej_lufinka>


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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2021-01-13 yarrick StatusNone => Fixed
        Assigned toNone => yarrick
        Open/ClosedOpen => Closed

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