[merged mm-stable] maple_tree-fix-mas_prev-and-mas_find-state-handling.patch removed from -mm tree

[merged mm-stable] maple_tree-fix-mas_prev-and-mas_find-state-handling.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: maple_tree: fix mas_prev() and mas_find() state handling
has been removed from the -mm tree.  Its filename was
     maple_tree-fix-mas_prev-and-mas_find-state-handling.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: fix mas_prev() and mas_find() state handling
Date: Fri, 20 Jan 2023 11:26:07 -0500

When mas_prev() does not find anything, set the state to MAS_NONE.

Handle the MAS_NONE in mas_find() like a MAS_START.

Link: https://lkml.kernel.org/r/20230120162650.984577-7-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reported-by: <syzbot+502859d610c661e56545@syzkaller.appspotmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/maple_tree.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/lib/maple_tree.c~maple_tree-fix-mas_prev-and-mas_find-state-handling
+++ a/lib/maple_tree.c
@@ -4845,7 +4845,7 @@ static inline void *mas_prev_entry(struc
 
 	if (mas->index < min) {
 		mas->index = mas->last = min;
-		mas_pause(mas);
+		mas->node = MAS_NONE;
 		return NULL;
 	}
 retry:
@@ -5919,6 +5919,7 @@ void *mas_prev(struct ma_state *mas, uns
 	if (!mas->index) {
 		/* Nothing comes before 0 */
 		mas->last = 0;
+		mas->node = MAS_NONE;
 		return NULL;
 	}
 
@@ -6009,6 +6010,9 @@ void *mas_find(struct ma_state *mas, uns
 		mas->index = ++mas->last;
 	}
 
+	if (unlikely(mas_is_none(mas)))
+		mas->node = MAS_START;
+
 	if (unlikely(mas_is_start(mas))) {
 		/* First run or continue */
 		void *entry;
_

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