The patch titled Subject: maple_tree: fix mt_destroy_walk() on root leaf node has been added to the -mm mm-hotfixes-unstable branch. Its filename is maple_tree-fix-mt_destroy_walk-on-root-leaf-node.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Wei Yang richard.weiyang@gmail.com Subject: maple_tree: fix mt_destroy_walk() on root leaf node Date: Tue, 24 Jun 2025 15:18:40 -0400

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... Link: https://lkml.kernel.org/r/20250624191841.64682-1-Liam.Howlett@oracle.com Fixes: 54a611b60590 ("Maple Tree: add new data structure") Signed-off-by: Wei Yang richard.weiyang@gmail.com Signed-off-by: Liam R. Howlett Liam.Howlett@oracle.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

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

--- a/lib/maple_tree.c~maple_tree-fix-mt_destroy_walk-on-root-leaf-node +++ a/lib/maple_tree.c @@ -5319,6 +5319,7 @@ static void mt_destroy_walk(struct maple struct maple_enode *start;

if (mte_is_leaf(enode)) { + mte_set_node_dead(enode); node->type = mte_node_type(enode); goto free_leaf; } _

Patches currently in -mm which might be from richard.weiyang@gmail.com are

maple_tree-fix-mt_destroy_walk-on-root-leaf-node.patch maple_tree-assert-retrieving-new-value-on-a-tree-containing-just-a-leaf-node.patch