Commit ea9b77f9 authored by Wei Yang's avatar Wei Yang Committed by Andrew Morton
Browse files

maple_tree: fix mt_destroy_walk() on root leaf node 

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: 54a611b6 ("Maple Tree: add new data structure")
Signed-off-by: default avatarWei Yang <richard.weiyang@gmail.com>
Signed-off-by: default avatarLiam R. Howlett <Liam.Howlett@oracle.com>
Reviewed-by: default avatarDev Jain <dev.jain@arm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent fea18c68

lib/maple_tree.c

+1 −0
Original line number Diff line number Diff line
@@ -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;

	}