[PATCH] drm/radeon: fix copy of uninitialized variable back to userspace

[Alex Deucher]

Applied.  Thanks!

Alex

On Wed, Mar 3, 2021 at 2:42 AM Christian König <christian.koenig at amd.com> wrote:
>
> Am 03.03.21 um 01:27 schrieb Colin King:
> > From: Colin Ian King <colin.king at canonical.com>
> >
> > Currently the ioctl command RADEON_INFO_SI_BACKEND_ENABLED_MASK can
> > copy back uninitialised data in value_tmp that pointer *value points
> > to. This can occur when rdev->family is less than CHIP_BONAIRE and
> > less than CHIP_TAHITI.  Fix this by adding in a missing -EINVAL
> > so that no invalid value is copied back to userspace.
> >
> > Addresses-Coverity: ("Uninitialized scalar variable)
> > Cc: stable at vger.kernel.org # 3.13+
> > Fixes: 439a1cfffe2c ("drm/radeon: expose render backend mask to the userspace")
> > Signed-off-by: Colin Ian King <colin.king at canonical.com>
>
> Reviewed-by: Christian König <christian.koenig at amd.com>
>
> Let's hope that this doesn't break UAPI.
>
> Christian.
>
> > ---
> >   drivers/gpu/drm/radeon/radeon_kms.c | 1 +
> >   1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
> > index 2479d6ab7a36..58876bb4ef2a 100644
> > --- a/drivers/gpu/drm/radeon/radeon_kms.c
> > +++ b/drivers/gpu/drm/radeon/radeon_kms.c
> > @@ -518,6 +518,7 @@ int radeon_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
> >                       *value = rdev->config.si.backend_enable_mask;
> >               } else {
> >                       DRM_DEBUG_KMS("BACKEND_ENABLED_MASK is si+ only!\n");
> > +                     return -EINVAL;
> >               }
> >               break;
> >       case RADEON_INFO_MAX_SCLK:
>
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