drm/amdgpu/mes: fix use-after-free issue

jira VULN-8245
cve CVE-2024-38581
commit-author Jack Xiao <[email protected]>
commit 9482552

Delete fence fallback timer to fix the ramdom
use-after-free issue.

v2: move to amdgpu_mes.c

	Signed-off-by: Jack Xiao <[email protected]>
	Acked-by: Lijo Lazar <[email protected]>
	Acked-by: Christian König <[email protected]>
	Signed-off-by: Alex Deucher <[email protected]>
(cherry picked from commit 9482552)
	Signed-off-by: Marcin Wcisło <[email protected]>

Author: pvts-mat

drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c

@@ -1067,6 +1067,7 @@ void amdgpu_mes_remove_ring(struct amdgpu_device *adev,
 		return;
 
 	amdgpu_mes_remove_hw_queue(adev, ring->hw_queue_id);
+	del_timer_sync(&ring->fence_drv.fallback_timer);
 	amdgpu_ring_fini(ring);
 	kfree(ring);
 }