From: Stephan Mueller <smueller@chronox.de>
To: herbert@gondor.apana.org.au, davem@davemloft.net, trix@redhat.com
Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
Tom Rix <trix@redhat.com>
Subject: Re: [PATCH] crypto: drbg: check blocklen is non zero
Date: Sun, 02 Aug 2020 20:29:05 +0200 [thread overview]
Message-ID: <9904643.2WqB4rESCP@tauon.chronox.de> (raw)
In-Reply-To: <20200802171247.16558-1-trix@redhat.com>
Am Sonntag, 2. August 2020, 19:12:47 CEST schrieb trix@redhat.com:
Hi Tom,
> From: Tom Rix <trix@redhat.com>
>
> Clang static analysis reports this error
>
> crypto/drbg.c:441:40: warning: Division by zero
> padlen = (inputlen + sizeof(L_N) + 1) % (drbg_blocklen(drbg));
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
>
> When drbg_bocklen fails it returns 0.
>
> if (drbg && drbg->core)
> return drbg->core->blocklen_bytes;
> return 0;
>
> In many places in drbg_ctr_df drbg_bocklen is assumed to be non zero.
> So turn the assumption into a check.
>
> Fixes: 541af946fe13 ("crypto: drbg - SP800-90A Deterministic Random Bit
> Generator")
>
> Signed-off-by: Tom Rix <trix@redhat.com>
Thank you.
Reviewed-by: Stephan Mueller <smueller@chronox.de>
Ciao
Stephan
next prev parent reply other threads:[~2020-08-02 18:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-02 17:12 [PATCH] crypto: drbg: check blocklen is non zero trix
2020-08-02 18:29 ` Stephan Mueller [this message]
2020-08-20 7:15 ` Herbert Xu
2020-08-20 13:27 ` Tom Rix
2020-08-20 20:06 ` Herbert Xu
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