[PATCH 6.1 35/45] drm/amdgpu: Fix possible NULL dereference in amdgpu_ras_query_error_status_helper()

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6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Srinivasan Shanmugam <srinivasan.shanmugam@xxxxxxx>

commit b8d55a90fd55b767c25687747e2b24abd1ef8680 upstream.

Return invalid error code -EINVAL for invalid block id.

Fixes the below:

drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:1183 amdgpu_ras_query_error_status_helper() error: we previously assumed 'info' could be null (see line 1176)

Suggested-by: Hawking Zhang <Hawking.Zhang@xxxxxxx>
Cc: Tao Zhou <tao.zhou1@xxxxxxx>
Cc: Hawking Zhang <Hawking.Zhang@xxxxxxx>
Cc: Christian König <christian.koenig@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@xxxxxxx>
Reviewed-by: Hawking Zhang <Hawking.Zhang@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
[Ajay: applied AMDGPU_RAS_BLOCK_COUNT condition to amdgpu_ras_query_error_status()
       as amdgpu_ras_query_error_status_helper() not present in v6.6, v6.1
       amdgpu_ras_query_error_status_helper() was introduced in 8cc0f5669eb6]
Signed-off-by: Ajay Kaher <ajay.kaher@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
@@ -974,6 +974,9 @@ int amdgpu_ras_query_error_status(struct
 	if (!obj)
 		return -EINVAL;
 
+	if (!info || info->head.block == AMDGPU_RAS_BLOCK_COUNT)
+		return -EINVAL;
+
 	if (info->head.block == AMDGPU_RAS_BLOCK__UMC) {
 		amdgpu_ras_get_ecc_info(adev, &err_data);
 	} else {






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