From: Wei Yang Date: Tue, 24 Jun 2025 19:18:40 +0000 (-0400) Subject: maple_tree: fix mt_destroy_walk() on root leaf node X-Git-Tag: v6.16-rc6~5^2~14 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ea9b77f98d94c4d5c1bd1ac1db078f78b40e8bf5;p=thirdparty%2Fkernel%2Flinux.git 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: 54a611b60590 ("Maple Tree: add new data structure") Signed-off-by: Wei Yang Signed-off-by: Liam R. Howlett Reviewed-by: Dev Jain Cc: Signed-off-by: Andrew Morton --- diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 00524e55a21e0..ef66be963798e 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; }