linux-kernel - Re: [PATCH v2] crypto: ccp: initialize error

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Date:   Tue, 10 Jan 2023 11:03:08 -0600
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Tom Rix <trix@...hat.com>, brijesh.singh@....com,
        john.allen@....com, herbert@...dor.apana.org.au,
        davem@...emloft.net, nathan@...nel.org, ndesaulniers@...gle.com
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v2] crypto: ccp: initialize error

On 1/10/23 10:53, Tom Rix wrote:
> clang static analysis reports this problem

s/clang/Clang/

> 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>

The subject is pretty generic and confusing. A better subject would be:

crypto: ccp: Fix use of uninitialized variable

or something along that line.

Thanks,
Tom

> ---
> v2 : cleanup commit log
> ---
> drivers/crypto/ccp/sev-dev.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
> index 56998bc579d6..643cccc06a0b 100644
> --- a/drivers/crypto/ccp/sev-dev.c
> +++ b/drivers/crypto/ccp/sev-dev.c
> @@ -1307,7 +1307,7 @@ EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user);
>   void sev_pci_init(void)
>   {
>   	struct sev_device *sev = psp_master->sev_data;
> -	int error, rc;
> +	int error = 0, rc;
>   
>   	if (!sev)
>   		return;