Hi Thomas / All,

Thanks for the info - I was able to add the function as suggested however I see that the structure in concern has a lot of other member variable like as mentioned below and I actually cannot find code reference in mbedtls_ssl_free to free all of them - please confirm if calling mbedtls_ssl_free is enough such that all allocated memory for all variables in mbedtls_ssl_context is released:

..........................................................

mbedtls_ssl_config
mbedtls_ssl_send_t
mbedtls_ssl_recv_t
mbedtls_ssl_recv_timeout_t
p_bio
mbedtls_ssl_session *session_in; /*!< current session data (in) */
mbedtls_ssl_session *session_out; /*!< current session data (out) */
mbedtls_ssl_session *session; /*!< negotiated session data */
mbedtls_ssl_session *session_negotiate; /*!< session data in negotiation */
mbedtls_ssl_handshake_params *handshake; /*!< params required only during
the handshake process */
mbedtls_ssl_transform *transform_in; /*!< current transform params (in) */
mbedtls_ssl_transform *transform_out; /*!< current transform params (in) */
mbedtls_ssl_transform *transform; /*!< negotiated transform params */
mbedtls_ssl_transform *transform_negotiate; /*!< transform params in negotiation */
unsigned char *in_buf; /*!< input buffer */
unsigned char *in_ctr; /*!< 64-bit incoming message counter
TLS: maintained by us
DTLS: read from peer */
unsigned char *in_hdr; /*!< start of record header */
unsigned char *in_len; /*!< two-bytes message length field */
unsigned char *in_iv; /*!< ivlen-byte IV */
unsigned char *in_msg; /*!< message contents (in_iv+ivlen) */
unsigned char *in_offt; /*!< read offset in application data */

..........................................................................................

Regards,

Prakash

On Tue, Feb 27, 2024 at 8:43 PM Thomas Daubney via mbed-tls <mbed-tls@lists.trustedfirmware.org> wrote:

Hi Prakash,

Thanks for getting in touch.

I think what you are after is the function:
void mbedtls_ssl_free(mbedtls_ssl_context *ssl)

You can find it's implementation in ssl_tls.c.

I hope that helps you out.

Thanks,
Tom

On Tue, 2024-02-27 at 20:19 +0530, Satya Prakash Prasad via mbed-tls
wrote:
> Hi,
>
> We are writing a client code which can accept or decline connection
> to the server - so for each connection I understand there is
> a mbedtls_ssl_context data established. Once the same is closed or
> not required we need to do deinitialize or free memory allocated to
> its member variables like - we need to free all memory allocated
> since we need it back else our application will run out of memory
> like:
>
> os_free(mbed_ctx->handshake);
> os_free(mbed_ctx->transform_negotiate);
> os_free(mbed_ctx->session_negotiate);
> os_free(mbed_ctx->in_buf);
> os_free(mbed_ctx->out_buf);
>
> But there are many member variables which also need to free memory if
> allocated and assigned to it.
>
> Is there a function / method that can free all memory
> for mbedtls_ssl_context instance variable?
>
> Thanks in advance.
>
> Regards,
> Prakash
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