linux-kernel - [PATCH Fix 2/2] test_maple_tree: Add test for spanning store of entire range.

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Date:   Sat, 25 Jun 2022 00:39:07 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yu Zhao <yuzhao@...gle.com>
Subject: [PATCH Fix 2/2] test_maple_tree: Add test for spanning store of
 entire range.

Entire range store over an existing tree would cause an underflow in
mas_spanning_store() when the tree is multiple levels.  Add a testcase
to ensure it doesn't happen again.

Fixes: 51282228cdd4 (lib/test_maple_tree: add testing for maple tree)
Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 lib/test_maple_tree.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/lib/test_maple_tree.c b/lib/test_maple_tree.c
index 9fc0618f4ae7..8de5705b7b9b 100644
--- a/lib/test_maple_tree.c
+++ b/lib/test_maple_tree.c
@@ -35676,6 +35676,19 @@ static noinline void check_spanning_write(struct maple_tree *mt)
 	mtree_unlock(mt);
 	mtree_destroy(mt);
 
+	for (i = 1; i <= max; i++)
+		mtree_test_store_range(mt, i * 10, i * 10 + 5, &i);
+
+	mtree_lock(mt);
+	mas_set_range(&mas, 9, 50006); /* Will expand to 0 - ULONG_MAX */
+	mas_store_gfp(&mas, NULL, GFP_KERNEL);
+	mas_set(&mas, 1205);
+	MT_BUG_ON(mt, mas_walk(&mas) != NULL);
+	mtree_unlock(mt);
+	mt_dump(mt);
+	mt_validate(mt);
+	mtree_destroy(mt);
+
 	/* Test spanning store that requires a right cousin rebalance */
 	mt_init_flags(mt, MT_FLAGS_ALLOC_RANGE);
 	for (i = 0; i <= max; i++)
-- 
2.35.1