[PATCH] drm/xe: Use local fence in error path of xe_migrate_clear

[Matthew Brost]

The intent of the error path in xe_migrate_clear is to wait on locally
generated fence and then return. The code is waiting on m->fence which
could be the local fence but this is only stable under the job mutex
leading to a possible UAF. Fix code to wait on local fence.

Fixes: dd08ebf6c352 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Signed-off-by: Matthew Brost <matthew.brost at intel.com>
---
 drivers/gpu/drm/xe/xe_migrate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_migrate.c b/drivers/gpu/drm/xe/xe_migrate.c
index df4282c71bf0..a83bebef3780 100644
--- a/drivers/gpu/drm/xe/xe_migrate.c
+++ b/drivers/gpu/drm/xe/xe_migrate.c
@@ -1177,7 +1177,7 @@ struct dma_fence *xe_migrate_clear(struct xe_migrate *m,
 err_sync:
 		/* Sync partial copies if any. FIXME: job_mutex? */
 		if (fence) {
-			dma_fence_wait(m->fence, false);
+			dma_fence_wait(fence, false);
 			dma_fence_put(fence);
 		}
 
-- 
2.34.1