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drm/ttm: Avoid NULL pointer deref for evicted BOs

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commit 491adc6a0f9903c32b05f284df1148de39e8e644 upstream.

It is possible for a BO to exist that is not currently associated with a
resource, e.g. because it has been evicted.

When devcoredump tries to read the contents of all BOs for dumping, we need
to expect this as well -- in this case, ENODATA is recorded instead of the
buffer contents.

Fixes: 7d08df5d0bd3 ("drm/ttm: Add ttm_bo_access")
Fixes: 09ac4fcb3f ("drm/ttm: Implement vm_operations_struct.access v2")
Cc: stable <stable@kernel.org>
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/6271
Signed-off-by: Simon Richter <Simon.Richter@hogyros.de>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Shuicheng Lin <shuicheng.lin@intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20251013161241.709916-1-Simon.Richter@hogyros.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Simon Richter
2025-10-14 01:11:33 +09:00
committed by Greg Kroah-Hartman
parent 3144af03d5
commit 3d004f7341
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/ttm/ttm_bo_vm.c
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@@ -421,6 +421,11 @@ int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
if (ret)
return ret;
if (!bo->resource) {
ret = -ENODATA;
goto unlock;
}
switch (bo->resource->mem_type) {
case TTM_PL_SYSTEM:
fallthrough;
@@ -435,6 +440,7 @@ int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
ret = -EIO;
}
unlock:
ttm_bo_unreserve(bo);
return ret;