[PATCH v2] drm/amdgpu: Add NULL ptr check for non userq fences

[Arunpravin Paneer Selvam]

We are observing a NULL value in the non userq fences,
thus added a NULL pointer check just to avoid the
NULL pointer dereference crash.

v2: Moved the NULL check above the non userq check.

Signed-off-by: Arunpravin Paneer Selvam <arunpravin.paneersel...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c
index 6157a540c929..76f7babd7a54 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c
@@ -815,6 +815,9 @@ int amdgpu_userq_wait_ioctl(struct drm_device *dev, void 
*data,
                        struct amdgpu_userq_fence *userq_fence;
                        u32 index;
 
+                       if (!fences[i])
+                               continue;
+
                        userq_fence = to_amdgpu_userq_fence(fences[i]);
                        if (!userq_fence) {
                                /*
-- 
2.25.1