[merged mm-hotfixes-stable] mm-damon-vaddr-protect-vma-traversal-in-__damon_va_thre_regions-with-rcu-read-lock.patch removed from -mm tree

[merged mm-hotfixes-stable] mm-damon-vaddr-protect-vma-traversal-in-__damon_va_thre_regions-with-rcu-read-lock.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/damon/vaddr: protect vma traversal in __damon_va_thre_regions() with rcu read lock
has been removed from the -mm tree.  Its filename was
     mm-damon-vaddr-protect-vma-traversal-in-__damon_va_thre_regions-with-rcu-read-lock.patch

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

------------------------------------------------------
From: "Liam R. Howlett" <Liam.Howlett@oracle.com>
Subject: mm/damon/vaddr: protect vma traversal in __damon_va_thre_regions() with rcu read lock
Date: Wed, 4 Sep 2024 17:12:04 -0700

Traversing VMAs of a given maple tree should be protected by rcu read
lock.  However, __damon_va_three_regions() is not doing the protection. 
Hold the lock.

Link: https://lkml.kernel.org/r/20240905001204.1481-1-sj@kernel.org
Fixes: d0cf3dd47f0d ("damon: convert __damon_va_three_regions to use the VMA iterator")
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: SeongJae Park <sj@kernel.org>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Closes: https://lore.kernel.org/b83651a0-5b24-4206-b860-cb54ffdf209b@roeck-us.net
Tested-by: Guenter Roeck <linux@roeck-us.net>
Cc: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/vaddr.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/mm/damon/vaddr.c~mm-damon-vaddr-protect-vma-traversal-in-__damon_va_thre_regions-with-rcu-read-lock
+++ a/mm/damon/vaddr.c
@@ -126,6 +126,7 @@ static int __damon_va_three_regions(stru
 	 * If this is too slow, it can be optimised to examine the maple
 	 * tree gaps.
 	 */
+	rcu_read_lock();
 	for_each_vma(vmi, vma) {
 		unsigned long gap;
 
@@ -146,6 +147,7 @@ static int __damon_va_three_regions(stru
 next:
 		prev = vma;
 	}
+	rcu_read_unlock();
 
 	if (!sz_range(&second_gap) || !sz_range(&first_gap))
 		return -EINVAL;
_

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

maple_tree-mark-three-functions-as-__maybe_unused.patch