[merged mm-stable] maple_tree-reduce-user-error-potential.patch removed from -mm tree

[merged mm-stable] maple_tree-reduce-user-error-potential.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: maple_tree: reduce user error potential
has been removed from the -mm tree.  Its filename was
     maple_tree-reduce-user-error-potential.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>
Subject: maple_tree: reduce user error potential
Date: Fri, 20 Jan 2023 11:26:04 -0500

When iterating, a user may operate on the tree and cause the maple state
to be altered and left in an unintuitive state.  Detect this scenario and
correct it by setting to the limit and invalidating the state.

Link: https://lkml.kernel.org/r/20230120162650.984577-4-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/maple_tree.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/lib/maple_tree.c~maple_tree-reduce-user-error-potential
+++ a/lib/maple_tree.c
@@ -4732,6 +4732,11 @@ static inline void *mas_next_entry(struc
 	unsigned long last;
 	enum maple_type mt;
 
+	if (mas->index > limit) {
+		mas->index = mas->last = limit;
+		mas_pause(mas);
+		return NULL;
+	}
 	last = mas->last;
 retry:
 	offset = mas->offset;
@@ -4838,6 +4843,11 @@ static inline void *mas_prev_entry(struc
 {
 	void *entry;
 
+	if (mas->index < min) {
+		mas->index = mas->last = min;
+		mas_pause(mas);
+		return NULL;
+	}
 retry:
 	while (likely(!mas_is_none(mas))) {
 		entry = mas_prev_nentry(mas, min, mas->index);
_

Patches currently in -mm which might be from Liam.Howlett@Oracle.com are