On 25/06/25 12:48 am, Liam R. Howlett wrote:

From: Wei Yang richard.weiyang@gmail.com

On destroy, we should set each node dead. But current code miss this when the maple tree has only the root node.

The reason is mt_destroy_walk() leverage mte_destroy_descend() to set node dead, but this is skipped since the only root node is a leaf.

Fixes this by setting the node dead if it is a leaf.

Link: https://lore.kernel.org/all/20250407231354.11771-1-richard.weiyang@gmail.com... Fixes: 54a611b60590 ("Maple Tree: add new data structure") Signed-off-by: Wei Yang richard.weiyang@gmail.com CC: Liam R. Howlett Liam.Howlett@Oracle.com Cc: stable@vger.kernel.org Signed-off-by: Liam R. Howlett Liam.Howlett@oracle.com

---

lib/maple_tree.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 6b0fc6ebbe363..85d17d943753d 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -5319,6 +5319,7 @@ static void mt_destroy_walk(struct maple_enode *enode, struct maple_tree *mt, struct maple_enode *start; if (mte_is_leaf(enode)) {

• mte_set_node_dead(enode);
  

  node->type = mte_node_type(enode); goto free_leaf; }

FWIW I have been reading the maple tree code and this looks good to me.

Reviewed-by: Dev Jain dev.jain@arm.com