From fe1b2c7c0e91856a8736448bb5f3bd17c6ebd4fe Mon Sep 17 00:00:00 2001 From: "Liam R. Howlett" Date: Sat, 30 Aug 2025 20:44:23 -0400 Subject: [PATCH] mt_validate() detect root of size 0 Signed-off-by: Liam R. Howlett --- lib/maple_tree.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 75cec454d050..a59e95bb6d9e 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -8262,8 +8262,10 @@ void mt_validate(struct maple_tree *mt) while (!mas_is_overflow(&mas)) { MAS_WARN_ON(&mas, mte_dead_node(mas.node)); end = mas_data_end(&mas); - if (MAS_WARN_ON(&mas, (end < mt_min_slot_count(mas.node)) && - (!mte_is_root(mas.node)))) { + if (MAS_WARN_ON(&mas, + ((end < mt_min_slot_count(mas.node)) && + (!mte_is_root(mas.node))) || + (mte_is_root(mas.node) && end < 1))) { pr_err("Invalid size %u of " PTR_FMT "\n", end, mas_mn(&mas)); } -- 2.51.0