On 6/5/2016 9:11 AM, Moti Avrahami wrote:
>
> Recently I upgraded libcurl to v7.49.0 and now I’m getting exception
> when connecting to some FTPS servers.
>
> The exception is about “Access violation reading location” and the
> callstack begin from mbedTLS.c in this function:
>
> void Curl_mbedtls_session_free(void *ptr)
>
> {
>
> mbedtls_ssl_session_free(ptr);
>
> free(ptr);
>
> }
>
> The second command (free) go deep to this:
>
> File: C:\Program Files (x86)\Microsoft Visual Studio
> 9.0\VC\crt\src\dbgheap.c
>
> Line: 1132
>
> Expression: _CrtIsValidHeapPointer(pUserData)
>
> Does someone else encounter it?
>

I haven't, but I don't have a mbedTLS setup for Visual Studio at the
moment. FTPS with session resume is working here with mbedTLS since the
session resume fix [1]. The code you cite is correct because
mbedtls_ssl_session_free only frees what's in the session object but not
the object itself. That is why it's followed by a call to free.

What do you mean by some ftps servers? Is there a specific server? Can
you try to reproduce in the latest curl master and check if it's a
specific server type that's giving you the problem?

[1]: https://github.com/curl/curl/commit/9f498de

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Received on 2016-06-06