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@xxxxxxxxxx>
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@xxxxxxxxxx
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxx are
