[PATCH v2 1/1] drm/xe: Prevent null pointer access in xe_migrate_copy

[Zhanjun Dong <zhanjun.dong@intel.com>]

Update lacks source flag to include resource is null case. This will
prevent null pointer derefrence in xe_migrate_copy.

Signed-off-by: Zhanjun Dong <zhanjun.dong@intel.com>
---
 drivers/gpu/drm/xe/xe_bo.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_bo.c b/drivers/gpu/drm/xe/xe_bo.c
index 5f2f1ec46b57..5e8f60a8d431 100644
--- a/drivers/gpu/drm/xe/xe_bo.c
+++ b/drivers/gpu/drm/xe/xe_bo.c
@@ -682,8 +682,8 @@ static int xe_bo_move(struct ttm_buffer_object *ttm_bo, bool evict,
 	tt_has_data = ttm && (ttm_tt_is_populated(ttm) ||
 			      (ttm->page_flags & TTM_TT_FLAG_SWAPPED));
 
-	move_lacks_source = handle_system_ccs ? (!bo->ccs_cleared)  :
-						(!mem_type_is_vram(old_mem_type) && !tt_has_data);
+	move_lacks_source = !old_mem || (handle_system_ccs ? (!bo->ccs_cleared) :
+					 (!mem_type_is_vram(old_mem_type) && !tt_has_data));
 
 	needs_clear = (ttm && ttm->page_flags & TTM_TT_FLAG_ZERO_ALLOC) ||
 		(!ttm && ttm_bo->type == ttm_bo_type_device);
-- 
2.34.1