drm/amdkfd: Fix UBSAN shift-out-of-bounds warning

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If get_num_sdma_queues or get_num_xgmi_sdma_queues is 0, we end up
doing a shift operation where the number of bits shifted equals
number of bits in the operand. This behaviour is undefined.

Set num_sdma_queues or num_xgmi_sdma_queues to ULLONG_MAX, if the
count is >= number of bits in the operand.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1472

Reported-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Anson Jacob <Anson.Jacob@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Tested-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Anson Jacob 2021-03-03 12:33:15 -05:00 • committed by Alex Deucher

parent 47bfa5f60f

commit 50e2fc36e7

1 changed files with 15 additions and 2 deletions

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17

drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c

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