linux-kernel - Re: [PATCH v2] crypto: DRBG - always try to free Jitter RNG instance

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Date:   Sun, 07 Jun 2020 15:07:34 +0200
From:   Stephan Müller <smueller@...onox.de>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>, davem@...emloft.net,
        herbert@...dor.apana.org.au, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        syzbot <syzbot+2e635807decef724a1fa@...kaller.appspotmail.com>
Subject: Re: [PATCH v2] crypto: DRBG - always try to free Jitter RNG instance

Am Freitag, 5. Juni 2020, 18:21:49 CEST schrieb Eric Biggers:

Hi Eric,

> To be concrete, I'm suggesting:
> 
> 	if (!IS_ERR_OR_NULL(drbg->jent))
> 		crypto_free_rng(drbg->jent);
> 	drbg->jent = NULL;

I currently do not see that this could lead to an issue. But you are right, we 
should use defensive programming everywhere.

I will send a v3 shortly.

Thanks.


Ciao
Stephan