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.
This patch fixes this by setting the root dead before mt_destroy_walk().
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 --- lib/maple_tree.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 198c14dd3377..d31f0a2858f7 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -5347,6 +5347,8 @@ static inline void mte_destroy_walk(struct maple_enode *enode, { struct maple_node *node = mte_to_node(enode);
+ mte_set_node_dead(enode); + if (mt_in_rcu(mt)) { mt_destroy_walk(enode, mt, false); call_rcu(&node->rcu, mt_free_walk);