The patch titled
Subject: maple_tree: fix mas_empty_area_rev() search exhaustion at root node
has been added to the -mm mm-unstable branch. Its filename is
maple-tree-add-new-data-structure-fix-5.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/maple-tree-add-new-data-structure-fix-5.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: maple_tree: fix mas_empty_area_rev() search exhaustion at root node
Date: Tue, 12 Jul 2022 01:50:36 +0000
When the possibilities of finding a gap are exhausted at the root node,
the error code was not returned which results in returning a range that
is currently occupied. Add the necessary check for the error code and
return to the caller.
Link: https://lkml.kernel.org/r/20220712014957.4064879-1-Liam.Howlett@xxxxxxxxxx
Fixes: d0aac5e48048 (Maple Tree: add new data structure)
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Reported-by: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Tested-by: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/maple_tree.c | 3 +++
1 file changed, 3 insertions(+)
--- a/lib/maple_tree.c~maple-tree-add-new-data-structure-fix-5
+++ a/lib/maple_tree.c
@@ -5287,6 +5287,9 @@ int mas_empty_area_rev(struct ma_state *
}
}
+ if (mas_is_err(mas))
+ return xa_err(mas->node);
+
if (unlikely(mas->offset == MAPLE_NODE_SLOTS))
return -EBUSY;
_
Patches currently in -mm which might be from liam.howlett@xxxxxxxxxx are
android-binder-fix-lockdep-check-on-clearing-vma.patch
maple-tree-add-new-data-structure-fix.patch
maple-tree-add-new-data-structure-fix-2.patch
maple-tree-add-new-data-structure-fix-3.patch
maple-tree-add-new-data-structure-fix-4.patch
maple-tree-add-new-data-structure-fix-5.patch
lib-test_maple_tree-add-testing-for-maple-tree-fix.patch
lib-test_maple_tree-add-testing-for-maple-tree-fix-2.patch
lib-test_maple_tree-add-testing-for-maple-tree-fix-3.patch
mm-mmap-change-do_brk_flags-to-expand-existing-vma-and-add-do_brk_munmap-fix.patch
mm-mmap-use-advanced-maple-tree-api-for-mmap_region-fix.patch
mm-remove-the-vma-linked-list-fix-3.patch
mm-mlock-drop-dead-code-in-count_mm_mlocked_page_nr.patch
