buglwIP - A Lightweight TCP/IP stack - Bugs: bug #64045, [altcp_tls_mbedtls.c] Warnings...


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bug #64045: [altcp_tls_mbedtls.c] Warnings about not checked return values from mbedtls_ssl_flush_output()

Submitter:  Giuseppe Modugno <giusloq>
Submitted:  Fri 14 Apr 2023 08:18:58 AM UTC
Category:  apps Severity:  3 - Normal
Item Group:  Compiler Warning Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open Planned Release:  None
lwIP version:  git head

Thu 04 May 2023 11:53:49 AM UTC, comment #1: 
Jonathan D <jona>
Fri 14 Apr 2023 08:18:58 AM UTC, original submission:  

In altcp_tls_mbedtls. there are some calls to mbedtls_ssl_flush_output(). This is a function that is defined as:

int mbedtls_ssl_flush_output(mbedtls_ssl_context *ssl);

in ssl_internal.h.

In my build process, the compiler emits some warnings as the following:

lwip\src\apps\altcp_tls\altcp_tls_mbedtls.c|532|warning: ignoring return value of 'mbedtls_ssl_flush_output', declared with attribute warn_unused_result [-Wunused-result]|

It seems it is important to check the error code returned by this function, but lwip does not.

Giuseppe Modugno <giusloq>


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