drm/radeon: Don't dereference possibly-NULL pointer.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index 6f70158..df6a4db 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -241,7 +241,8 @@ int radeon_bo_pin_restricted(struct radeon_bo *bo, u32 domain, u64 max_offset,
                                domain_start = bo->rdev->mc.vram_start;
                        else
                                domain_start = bo->rdev->mc.gtt_start;
-                       WARN_ON_ONCE((*gpu_addr - domain_start) > max_offset);
+                       WARN_ON_ONCE(max_offset <
+                                    (radeon_bo_gpu_offset(bo) - domain_start));
                }
 
                return 0;