[PATCH] drm/amdgpu: Fix the null pointer dereference for amdgpu_ras_reset_error_status

[Bob Zhou]

Check return value and conduct null pointer handling to avoid null pointer 
dereference.

Signed-off-by: Bob Zhou <bob.z...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
index 68e9935028db..0ea836b376a6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
@@ -1442,6 +1442,9 @@ int amdgpu_ras_reset_error_status(struct amdgpu_device 
*adev,
        if (amdgpu_ras_reset_error_count(adev, block) == -EOPNOTSUPP)
                return 0;
 
+       if (!block_obj || !block_obj->hw_ops)
+               return -EINVAL;
+
        if ((block == AMDGPU_RAS_BLOCK__GFX) ||
            (block == AMDGPU_RAS_BLOCK__MMHUB)) {
                if (block_obj->hw_ops->reset_ras_error_status)
-- 
2.34.1