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drm/amdgpu: validate doorbell_offset in user queue creation

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amdgpu_userq_get_doorbell_index() passes the user-provided
doorbell_offset to amdgpu_doorbell_index_on_bar() without bounds
checking. An arbitrarily large doorbell_offset can cause the
calculated doorbell index to fall outside the allocated doorbell BO,
potentially corrupting kernel doorbell space.

Validate that doorbell_offset falls within the doorbell BO before
computing the BAR index, using u64 arithmetic to prevent overflow.

Fixes: f09c1e6077 ("drm/amdgpu: generate doorbell index for userqueue")
Reported-by: Yuhao Jiang <danisjiang@gmail.com>
Signed-off-by: Junrui Luo <moonafterrain@outlook.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit de1ef4ffd7)
Cc: stable@vger.kernel.org
This commit is contained in:
Junrui Luo
2026-03-24 17:39:02 +08:00
committed by Alex Deucher
parent a3ffaa5b39
commit a018d1819f
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c
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@@ -600,6 +600,13 @@ amdgpu_userq_get_doorbell_index(struct amdgpu_userq_mgr *uq_mgr,
goto unpin_bo;
}
/* Validate doorbell_offset is within the doorbell BO */
if ((u64)db_info->doorbell_offset * db_size + db_size >
amdgpu_bo_size(db_obj->obj)) {
r = -EINVAL;
goto unpin_bo;
}
index = amdgpu_doorbell_index_on_bar(uq_mgr->adev, db_obj->obj,
db_info->doorbell_offset, db_size);
drm_dbg_driver(adev_to_drm(uq_mgr->adev),