drm/amdkfd: Fix kfd process ref leaking when userptr unmapping

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kfd_lookup_process_by_pid hold the kfd process reference to ensure it
doesn't get destroyed while sending the segfault event to user space.

Calling kfd_lookup_process_by_pid as function parameter leaks the kfd
process refcount and miss the NULL pointer check if app process is
already destroyed.

Fixes: 2d274bf709 ("amd/amdkfd: Trigger segfault for early userptr unmmapping")
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Philip Yang 2025-05-27 11:09:53 -04:00 • committed by Alex Deucher

parent 0c67342885

commit 58e6fc2fb9

1 changed files with 7 additions and 2 deletions

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

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