drm/xe/vm: Fix an error path

If using the VM_BIND_OP_UNMAP_ALL without any bound vmas for the
vm, we will end up dereferencing an uninitialized variable and leak a
bo lock. Fix this.

v2:
- Updated commit message (Lucas De Marchi)

Reported-by: Dafna Hirschfeld <dhirschfeld@habana.ai>
Closes: https://lore.kernel.org/intel-xe/jrwua7ckbiozfcaodx4gg2h4taiuxs53j5zlpf3qzvyhyiyl2d@pbs3plurokrj/
Suggested-by: Dafna Hirschfeld <dhirschfeld@habana.ai>
Fixes: b06d47be7c83 ("drm/xe: Port Xe to GPUVA")
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Acked-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231222175904.16732-1-thomas.hellstrom@linux.intel.com

diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index 1ca917b..1278426 100644 (file)
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -2063,9 +2063,11 @@ vm_bind_ioctl_ops_create(struct xe_vm *vm, struct xe_bo *bo,
                if (err)
                        return ERR_PTR(err);
 
-               vm_bo = drm_gpuvm_bo_find(&vm->gpuvm, obj);
-               if (!vm_bo)
-                       break;
+               vm_bo = drm_gpuvm_bo_obtain(&vm->gpuvm, obj);
+               if (IS_ERR(vm_bo)) {
+                       xe_bo_unlock(bo);
+                       return ERR_CAST(vm_bo);
+               }
 
                ops = drm_gpuvm_bo_unmap_ops_create(vm_bo);
                drm_gpuvm_bo_put(vm_bo);