From: Liam R. Howlett <Liam.Howlett@oracle.com>
Date: Sun, 31 Aug 2025 00:44:23 +0000 (-0400)
Subject: mt_validate() detect root of size 0
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=75a8b16a20c74a95d03223cfa0f8d04fa498aa9b;p=users%2Fjedix%2Flinux-maple.git

mt_validate() detect root of size 0

Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
---

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));
 		}