[PATCH] drm/amdgpu: Fix out-of-bounds write warning

[Ma Jun]

Check the ring type value to fix the out-of-bounds
write warning

Signed-off-by: Ma Jun <jun....@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
index 06f0a6534a94..1e0b5bb47bc9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
@@ -353,6 +353,11 @@ int amdgpu_ring_init(struct amdgpu_device *adev, struct 
amdgpu_ring *ring,
        ring->hw_prio = hw_prio;
 
        if (!ring->no_scheduler) {
+               if (ring->funcs->type >= AMDGPU_HW_IP_NUM) {
+                       dev_warn(adev->dev, "ring type %d has no scheduler\n", 
ring->funcs->type);
+                       return 0;
+               }
+
                hw_ip = ring->funcs->type;
                num_sched = &adev->gpu_sched[hw_ip][hw_prio].num_scheds;
                adev->gpu_sched[hw_ip][hw_prio].sched[(*num_sched)++] =
-- 
2.34.1