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 gargage
value.
Fixes: 3d725965f836 ("crypto: ccp - Add SEV_INIT_EX support")
Signed-off-by: Tom Rix <[email protected]>
---
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
On Tue, Jan 10, 2023 at 9:18 AM Tom Rix <[email protected]> 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 gargage
garbage
> value.
>
> Fixes: 3d725965f836 ("crypto: ccp - Add SEV_INIT_EX support")
Should this be: 'Fixes: 200664d5237f ("crypto: ccp: Add Secure
Encrypted Virtualization (SEV) command support")'
Since in that patch an uninitialized error can be printed?
+void psp_pci_init(void)
+{
+ struct sev_user_data_status *status;
+ struct sp_device *sp;
+ int error, rc;
+
+ sp = sp_get_psp_master_device();
+ if (!sp)
+ return;
+
+ psp_master = sp->psp_data;
+
+ /* Initialize the platform */
+ rc = sev_platform_init(&error);
+ if (rc) {
+ dev_err(sp->dev, "SEV: failed to INIT error %#x\n", error);
+ goto err;
+ }
...
+static int __sev_platform_init_locked(int *error)
+{
+ struct psp_device *psp = psp_master;
+ int rc = 0;
+
+ if (!psp)
+ return -ENODEV;
+
+ if (psp->sev_state == SEV_STATE_INIT)
+ return 0;
So if !psp an uninitialized error is printed?
> Signed-off-by: Tom Rix <[email protected]>
> ---
> 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
>
On 1/10/23 8:27 AM, Peter Gonda wrote:
> On Tue, Jan 10, 2023 at 9:18 AM Tom Rix <[email protected]> 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 gargage
> garbage
ok
>
>> value.
>>
>> Fixes: 3d725965f836 ("crypto: ccp - Add SEV_INIT_EX support")
> Should this be: 'Fixes: 200664d5237f ("crypto: ccp: Add Secure
> Encrypted Virtualization (SEV) command support")'
>
> Since in that patch an uninitialized error can be printed?
It was a bit of a toss up on who is at fault. This is fine, i'll change
this as well.
Thanks
Tom
> +void psp_pci_init(void)
> +{
> + struct sev_user_data_status *status;
> + struct sp_device *sp;
> + int error, rc;
> +
> + sp = sp_get_psp_master_device();
> + if (!sp)
> + return;
> +
> + psp_master = sp->psp_data;
> +
> + /* Initialize the platform */
> + rc = sev_platform_init(&error);
> + if (rc) {
> + dev_err(sp->dev, "SEV: failed to INIT error %#x\n", error);
> + goto err;
> + }
>
>
> ...
>
> +static int __sev_platform_init_locked(int *error)
> +{
> + struct psp_device *psp = psp_master;
> + int rc = 0;
> +
> + if (!psp)
> + return -ENODEV;
> +
> + if (psp->sev_state == SEV_STATE_INIT)
> + return 0;
>
>
> So if !psp an uninitialized error is printed?
>
>> Signed-off-by: Tom Rix <[email protected]>
>> ---
>> 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
>>
On Tue, Jan 10, 2023 at 9:48 AM Tom Rix <[email protected]> wrote:
>
>
> On 1/10/23 8:27 AM, Peter Gonda wrote:
> > On Tue, Jan 10, 2023 at 9:18 AM Tom Rix <[email protected]> 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 gargage
> > garbage
> ok
> >
> >> value.
> >>
> >> Fixes: 3d725965f836 ("crypto: ccp - Add SEV_INIT_EX support")
> > Should this be: 'Fixes: 200664d5237f ("crypto: ccp: Add Secure
> > Encrypted Virtualization (SEV) command support")'
> >
> > Since in that patch an uninitialized error can be printed?
>
> It was a bit of a toss up on who is at fault. This is fine, i'll change
> this as well.
Ack. Not trying to play a blame game =]. Just thought this patch might
as well be backported back to anyone using this function.
If you are sending another version you can add:
Reviewed-by: Peter Gonda <[email protected]>
>
> Thanks
>
> Tom
>
>
> > +void psp_pci_init(void)
> > +{
> > + struct sev_user_data_status *status;
> > + struct sp_device *sp;
> > + int error, rc;
> > +
> > + sp = sp_get_psp_master_device();
> > + if (!sp)
> > + return;
> > +
> > + psp_master = sp->psp_data;
> > +
> > + /* Initialize the platform */
> > + rc = sev_platform_init(&error);
> > + if (rc) {
> > + dev_err(sp->dev, "SEV: failed to INIT error %#x\n", error);
> > + goto err;
> > + }
> >
> >
> > ...
> >
> > +static int __sev_platform_init_locked(int *error)
> > +{
> > + struct psp_device *psp = psp_master;
> > + int rc = 0;
> > +
> > + if (!psp)
> > + return -ENODEV;
> > +
> > + if (psp->sev_state == SEV_STATE_INIT)
> > + return 0;
> >
> >
> > So if !psp an uninitialized error is printed?
> >
> >> Signed-off-by: Tom Rix <[email protected]>
> >> ---
> >> 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
> >>
>