diff mbox series

[v3] crypto: ccp: initialize 'error' variable to zero

Message ID 20230110170848.3022682-1-trix@redhat.com
State New
Headers
Series [v3] crypto: ccp: initialize 'error' variable to zero |

Commit Message

Tom Rix Jan. 10, 2023, 5:08 p.m. UTC 
  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@redhat.com>
---
v2 cleanup commit log
v3 cleanup commit log
---
 drivers/crypto/ccp/sev-dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Nick Desaulniers Jan. 17, 2023, 6:17 p.m. UTC | #1 
On Tue, Jan 10, 2023 at 9:09 AM Tom Rix <trix@redhat.com> 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@redhat.com>

Thanks for the patch!
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>

> ---
> v2 cleanup commit log
> v3 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;
> --
> 2.27.0
>
>
Tom Lendacky Jan. 17, 2023, 6:44 p.m. UTC | #2 
On 1/10/23 11:08, 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@redhat.com>

Acked-by: Tom Lendacky <thomas.lendacky@amd.com>

> ---
> v2 cleanup commit log
> v3 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;
Herbert Xu Jan. 20, 2023, 10:08 a.m. UTC | #3 
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@redhat.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,
diff mbox series

Patch

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;