drm/amdgpu: check ras and obj before dereference

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nbio_v7_9_handle_ras_controller_intr_no_bifring() dereferences ras and obj
without checking either for NULL. Both amdgpu_ras_get_context() and
amdgpu_ras_find_obj() can return NULL, e.g. during the window between
adev->nbio.ras being set (early in amdgpu_ras_init(), by design, to
enable the fatal-error interrupt as soon as possible) and the PCIE_BIF
ras object actually being created in RAS late_init. Any interrupt in that
window crashes in hard-IRQ context.

This is analogous to commit d190b459b2 ("drm/amdgpu: the warning
dereferencing obj for nbio_v7_4"), which fixed the same issue in the
nbio_v7_4 handler.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 7692e1ee24 ("drm/amdgpu: add RAS fatal error handler for NBIO v7.9")
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Signed-off-by: Dmitriy Chumachenko <Dmitry.Chumachenko@cyberprotect.ru>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit c7071767a5)

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Dmitriy Chumachenko 2026-09-14 17:33:03 +03:00 • committed by Alex Deucher

parent 636139603b

commit 723d4dc628

1 changed files with 1 additions and 1 deletions

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drivers/gpu/drm/amd/amdgpu/nbio_v7_9.c

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