linux-kernel - Re: [PATCH v2] crypto: remove instance when test failed

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Message-ID: <20150403095828.GA19273@gondor.apana.org.au>
Date:	Fri, 3 Apr 2015 17:58:28 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Stephan Mueller <smueller@...onox.de>
Cc:	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] crypto: remove instance when test failed

On Thu, Apr 02, 2015 at 07:05:27PM +0200, Stephan Mueller wrote:
>
> diff --git a/crypto/algapi.c b/crypto/algapi.c
> index 83b04e0..215c604 100644
> --- a/crypto/algapi.c
> +++ b/crypto/algapi.c
> @@ -545,6 +545,10 @@ unlock:
>  		goto err;
>  
>  	crypto_wait_for_test(larval);
> +
> +	/* Remove instance if test failed */
> +	if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
> +		crypto_unregister_instance(inst);

Unfortunately I don't think this is safe because the moment you
release the mutex the instance can be freed.  So you'll need to
hold a reference to it.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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