Hi Shaobo,
that question came up a couple of times now. And the answer is: No,
there can't be a NULL pointer dereference.
The function radeon_ttm_tt_to_gtt returns NULL only when it is an AGP
ttm structure, and that case is checked right before the offending code.
Unfortunately I don't see how an automated code checker should ever be
able to figure that out by itself.
Regards,
Christian.
Am 18.03.19 um 21:58 schrieb Shaobo He:
Hello everyone,
My name is Shaobo He and I am a graduate student at University of
Utah. I am using a static analysis tool to search for null pointer
dereferences and came across a potentially invalid memory access in
the file drivers/gpu/drm/radeon/radeon_ttm.c: in function
`radeon_ttm_tt_populate`, function `radeon_ttm_tt_to_gtt` can return a
NULL pointer which is dereferenced by the call to
`drm_prime_sg_to_page_addr_arrays`.
Please let me know if it makes sense. I am looking forward to your reply.
Best,
Shaobo
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