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

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Message-ID: <20140506082846.GB20931@xo-6d-61-c0.localdomain>
Date:	Tue, 6 May 2014 10:28:46 +0200
From:	Pavel Machek <pavel@....cz>
To:	Milos Vyletel <milos.vyletel@...il.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	"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 2014-04-30 15:17:54, 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>
> ---
>  arch/x86/crypto/sha1_ssse3_glue.c | 22 ++++++++++++----------
>  1 file changed, 12 insertions(+), 10 deletions(-)
> 
> diff --git a/arch/x86/crypto/sha1_ssse3_glue.c b/arch/x86/crypto/sha1_ssse3_glue.c
> index 74d16ef..5352196 100644
> --- a/arch/x86/crypto/sha1_ssse3_glue.c
> +++ b/arch/x86/crypto/sha1_ssse3_glue.c
> @@ -235,31 +235,33 @@ static bool __init avx2_usable(void)
>  
>  static int __init sha1_ssse3_mod_init(void)
>  {
> -	char *algo_name;
> -

Would simple "algo_name = NULL" be enough to fix this?

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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