netdev - Re: [PATCH] crypto: x86/curve25519 - fix cpu feature checking logic in mod

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Message-ID: <20210611072312.GE23016@gondor.apana.org.au>
Date:   Fri, 11 Jun 2021 15:23:12 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Hangbin Liu <liuhangbin@...il.com>
Cc:     linux-crypto@...r.kernel.org,
        "Jason A . Donenfeld" <Jason@...c4.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] crypto: x86/curve25519 - fix cpu feature checking logic
 in mod_exit

On Thu, Jun 03, 2021 at 01:53:40AM -0400, Hangbin Liu wrote:
> In curve25519_mod_init() the curve25519_alg will be registered only when
> (X86_FEATURE_BMI2 && X86_FEATURE_ADX). But in curve25519_mod_exit()
> it still checks (X86_FEATURE_BMI2 || X86_FEATURE_ADX) when do crypto
> unregister. This will trigger a BUG_ON in crypto_unregister_alg() as
> alg->cra_refcnt is 0 if the cpu only supports one of X86_FEATURE_BMI2
> and X86_FEATURE_ADX.
> 
> Fixes: 07b586fe0662 ("crypto: x86/curve25519 - replace with formally verified implementation")
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
> ---
>  arch/x86/crypto/curve25519-x86_64.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Patch applied.  Thanks.
-- 
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