[openssl-dev] [openssl.org #4614] pthread_once and malloc failures

[Alessandro Ghedini]

On Mon, Jul 11, 2016 at 04:20:29PM +0000, Kurt Roeckx via RT wrote:
> Hi,
> 
> When trying to check what happens if we simulate malloc()
> returning NULL I'm running into a problem that I'm not sure how to
> deal with.
> 
> We have CRYPTO_THREAD_run_once(), which takes an init() function
> that returns void, so it can't return failures.  At least the
> pthread_once() function also has it as void.
> 
> But if those functions call malloc() and that returns NULL, we now
> don't catch that error, and later just try to use a NULL pointer.
> 
> Anybody a good idea how to solve this?

As Viktor said, init_once is generally used to initialize some kind of global
state, so you can try to check the result after the CRYPTO_THREAD_run_once()
call.

Cheers
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