linux-kernel - Re: [PATCH] crypto: x86/sha1: fix coverity CID 1195603

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Message-ID: <20140508133025.GB12700@gondor.apana.org.au>
Date:	Thu, 8 May 2014 21:30:25 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Milos Vyletel <milos.vyletel@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"maintainer:X86 ARCHITECTURE..." <x86@...nel.org>,
	"open list:CRYPTO API" <linux-crypto@...r.kernel.org>,
	"open list:X86 ARCHITECTURE..." <linux-kernel@...r.kernel.org>,
	linux-coverity@...r.kernel.org
Subject: Re: [PATCH] crypto: x86/sha1: fix coverity CID 1195603

On Wed, Apr 30, 2014 at 03:17:54PM -0400, Milos Vyletel wrote:
> Coverity detected possible use of uninitialized pointer when printing info
> message during module load. While this is higly unlikely to cause any troubles
> simple change in sha1_ssse3_mod_init to make it look like sha256/512 init
> function will fix this.
> 
> 260
>    	6. Condition sha1_transform_asm, taking true branch
> 261        if (sha1_transform_asm) {
> 
> CID 1195603 (#1 of 1): Uninitialized pointer read (UNINIT)
> 7. uninit_use_in_call: Using uninitialized value algo_name when calling printk.
> 262                pr_info("Using %s optimized SHA-1 implementation\n", algo_name);
> 263                return crypto_register_shash(&alg);
> 264        }
> 
> Reported-by: <scan-admin@...erity.com>
> Signed-off-by: Milos Vyletel <milos.vyletel@...il.com>

Unless I'm missing something there is no way this code can use
the variable without initialising it.

So this is a false positive and I'm not applying this.

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
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