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drm/xe/vm: Clear the scratch_pt pointer on error

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Avoid triggering a dereference of an error pointer on cleanup in
xe_vm_free_scratch() by clearing any scratch_pt error pointer.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Fixes: 06951c2ee7 ("drm/xe: Use NULL PTEs as scratch PTEs")
Cc: Brian Welty <brian.welty@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: <stable@vger.kernel.org> # v6.8+
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://lore.kernel.org/r/20250821143045.106005-4-thomas.hellstrom@linux.intel.com
This commit is contained in:
Thomas Hellström 2025-08-21 16:30:45 +02:00
parent b5dd1505a3
commit 358ee50ab5
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/xe/xe_vm.c
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@ -1635,8 +1635,12 @@ static int xe_vm_create_scratch(struct xe_device *xe, struct xe_tile *tile,
for (i = MAX_HUGEPTE_LEVEL; i < vm->pt_root[id]->level; i++) {
vm->scratch_pt[id][i] = xe_pt_create(vm, tile, i);
if (IS_ERR(vm->scratch_pt[id][i]))
return PTR_ERR(vm->scratch_pt[id][i]);
if (IS_ERR(vm->scratch_pt[id][i])) {
int err = PTR_ERR(vm->scratch_pt[id][i]);
vm->scratch_pt[id][i] = NULL;
return err;
}
xe_pt_populate_empty(tile, vm, vm->scratch_pt[id][i]);
}