linux-kernel - Re: [PATCH v3] crypto: ccp: initialize 'error' variable to zero

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Message-ID: <Y8poLLMG8C31f91j@gondor.apana.org.au>
Date:   Fri, 20 Jan 2023 18:08:44 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Tom Rix <trix@...hat.com>
Cc:     brijesh.singh@....com, thomas.lendacky@....com, john.allen@....com,
        davem@...emloft.net, nathan@...nel.org, ndesaulniers@...gle.com,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v3] crypto: ccp: initialize 'error' variable to zero

On Tue, Jan 10, 2023 at 12:08:48PM -0500, Tom Rix wrote:
> Clang static analysis reports this problem
> drivers/crypto/ccp/sev-dev.c:1347:3: warning: 3rd function call
>   argument is an uninitialized value [core.CallAndMessage]
>     dev_err(sev->dev, "SEV: failed to INIT error %#x, rc %d\n",
>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> __sev_platform_init_locked() can return without setting the
> error parameter, causing the dev_err() to report a garbage
> value.
> 
> Fixes: 200664d5237f ("crypto: ccp: Add Secure Encrypted Virtualization (SEV) command support")
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
> v2 cleanup commit log
> v3 cleanup commit log
> ---
>  drivers/crypto/ccp/sev-dev.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

I think error should be removed completely on top of

https://patchwork.kernel.org/project/linux-crypto/patch/20230110191201.29666-1-jarkko@profian.com/

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