[PATCH v2] drm/amdgpu: Fix possible NULL dereference in amdgpu_ras_query_error_status_helper()

[Zhang, Hawking]

[AMD Official Use Only - General]

Reviewed-by: Hawking Zhang <Hawking.Zhang at amd.com>

Regards,
Hawking
-----Original Message-----
From: SHANMUGAM, SRINIVASAN <SRINIVASAN.SHANMUGAM at amd.com>
Sent: Wednesday, December 27, 2023 12:37
To: Deucher, Alexander <Alexander.Deucher at amd.com>; Koenig, Christian <Christian.Koenig at amd.com>
Cc: amd-gfx at lists.freedesktop.org; SHANMUGAM, SRINIVASAN <SRINIVASAN.SHANMUGAM at amd.com>; Zhang, Hawking <Hawking.Zhang at amd.com>; Zhou1, Tao <Tao.Zhou1 at amd.com>
Subject: [PATCH v2] drm/amdgpu: Fix possible NULL dereference in amdgpu_ras_query_error_status_helper()

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 at amd.com>
Cc: Tao Zhou <tao.zhou1 at amd.com>
Cc: Hawking Zhang <Hawking.Zhang at amd.com>
Cc: Christian König <christian.koenig at amd.com>
Cc: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam at 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 bad62141f708..9c4db031e5ee 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
@@ -1176,6 +1176,9 @@ static int amdgpu_ras_query_error_status_helper(struct amdgpu_device *adev,
        enum amdgpu_ras_block blk = info ? info->head.block : AMDGPU_RAS_BLOCK_COUNT;
        struct amdgpu_ras_block_object *block_obj = NULL;

+       if (blk == AMDGPU_RAS_BLOCK_COUNT)
+               return -EINVAL;
+
        if (error_query_mode == AMDGPU_RAS_INVALID_ERROR_QUERY)
                return -EINVAL;

--
2.34.1