drm/amdgpu: Fix last_update fence leak in amdgpu_vm_init()

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amdgpu_vm_init() initializes vm->last_update, vm->last_unlocked and
vm->last_tlb_flush with references to the stub fence taken via
dma_fence_get_stub().  The error label at the end of the function
releases the last_unlocked and last_tlb_flush references with
dma_fence_put(), but the reference stored in vm->last_update is never
dropped, so whenever the page table root creation, the reservation of
the root BO or the PASID registration fails, the stub fence reference
leaks.

Drop the vm->last_update reference together with the other stub fence
references on the error path.

Fixes: 187916e6ed ("drm/amdgpu: install stub fence into potential unused fence pointers")
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit e7979c84fc)
Cc: stable@vger.kernel.org

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Wentao Liang 2026-09-16 09:55:36 +00:00 • committed by Alex Deucher

parent a997baa611

commit b4f7b4459b

1 changed files with 1 additions and 0 deletions

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drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c

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