drm/amdgpu: Initialize UALink handle uniqueness state

amdgpu_generate_ualink_handle() continues when handle_lo is zero. For
accelerator ID 0, the random value can become zero after the low 10 bits
are cleared. This path reaches while (!unique) without assigning unique.

Clang's -Wconditional-uninitialized reports the read. A reduced
MemorySanitizer test reports use-of-uninitialized-value at the loop
condition.

If the uninitialized value ends the loop, handle 0 is inserted into
exp_xa while robj->ualink_handle_lo still says that the BO has no handle.
A later export can create another entry for the same BO.

Initialize unique to false so the zero-handle path repeats the loop.

Fixes: c67cb19811ec ("drm/amdgpu: Implement UALink handle export")
Assisted-by: LLM
Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
Signed-off-by: Felix Kuehling <felix.kuehling@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

0 files changed, 0 insertions, 0 deletions