Am 03.06.23 um 09:43 schrieb Min Li:
Userspace can race to free the gobj(robj converted from), robj should not
be accessed again after drm_gem_object_put, otherwith it will result in
use-after-free.
Signed-off-by: Min Li <lm0963hack@xxxxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
---
Changes in v2:
- Remove unused robj, avoid compile complain
drivers/gpu/drm/radeon/radeon_gem.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
index bdc5af23f005..d3f5ddbc1704 100644
--- a/drivers/gpu/drm/radeon/radeon_gem.c
+++ b/drivers/gpu/drm/radeon/radeon_gem.c
@@ -459,7 +459,6 @@ int radeon_gem_set_domain_ioctl(struct drm_device *dev, void *data,
struct radeon_device *rdev = dev->dev_private;
struct drm_radeon_gem_set_domain *args = data;
struct drm_gem_object *gobj;
- struct radeon_bo *robj;
int r;
/* for now if someone requests domain CPU -
@@ -472,13 +471,12 @@ int radeon_gem_set_domain_ioctl(struct drm_device *dev, void *data,
up_read(&rdev->exclusive_lock);
return -ENOENT;
}
- robj = gem_to_radeon_bo(gobj);
r = radeon_gem_set_domain(gobj, args->read_domains, args->write_domain);
drm_gem_object_put(gobj);
up_read(&rdev->exclusive_lock);
- r = radeon_gem_handle_lockup(robj->rdev, r);
+ r = radeon_gem_handle_lockup(rdev, r);
return r;
}
