The patch titled
Subject: test_maple_tree: add test for spanning store of entire range
has been added to the -mm mm-unstable branch. Its filename is
lib-test_maple_tree-add-testing-for-maple-tree-fix.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/lib-test_maple_tree-add-testing-for-maple-tree-fix.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Liam Howlett <liam.howlett@xxxxxxxxxx>
Subject: test_maple_tree: add test for spanning store of entire range
Date: Sat, 25 Jun 2022 00:39:07 +0000
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.
Link: https://lkml.kernel.org/r/20220625003854.1230114-3-Liam.Howlett@xxxxxxxxxx
Fixes: 51282228cdd4 (lib/test_maple_tree: add testing for maple tree)
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/test_maple_tree.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
--- a/lib/test_maple_tree.c~lib-test_maple_tree-add-testing-for-maple-tree-fix
+++ a/lib/test_maple_tree.c
@@ -35676,6 +35676,19 @@ static noinline void check_spanning_writ
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++)
_
Patches currently in -mm which might be from liam.howlett@xxxxxxxxxx are
maple-tree-add-new-data-structure-fix.patch
lib-test_maple_tree-add-testing-for-maple-tree-fix.patch
mm-mlock-drop-dead-code-in-count_mm_mlocked_page_nr.patch
