Re: [PATCH i-g-t 3/3] tests/amdgpu/amdgpu_command_submission: fix uaf

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Looks good to me.

Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun@xxxxxxxxx>


On 6/28/22 4:13 PM, Matthew Auld wrote:
../lib/amdgpu/amd_command_submission.c: In function ‘amdgpu_command_submission_write_linear_helper’:
../lib/amdgpu/amd_command_submission.c:201:13: warning: pointer ‘ring_context’ used after ‘free’ [-Wuse-after-free]
   201 |         r = amdgpu_cs_ctx_free(ring_context->context_handle);
       |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../lib/amdgpu/amd_command_submission.c:199:9: note: call to ‘free’ here
   199 |         free(ring_context);
       |         ^~~~~~~~~~~~~~~~~~

Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: Petri Latvala <petri.latvala@xxxxxxxxx>
---
  lib/amdgpu/amd_command_submission.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/amdgpu/amd_command_submission.c b/lib/amdgpu/amd_command_submission.c
index 4dc4df95..16939653 100644
--- a/lib/amdgpu/amd_command_submission.c
+++ b/lib/amdgpu/amd_command_submission.c
@@ -196,10 +196,10 @@ void amdgpu_command_submission_write_linear_helper(amdgpu_device_handle device,
  	}
  	/* clean resources */
  	free(ring_context->pm4);
-	free(ring_context);
  	/* end of test */
  	r = amdgpu_cs_ctx_free(ring_context->context_handle);
  	igt_assert_eq(r, 0);
+	free(ring_context);
  }



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