+ mm-damon-core-fix-commit_ops_filters-by-using-correct-nth-function.patch added to mm-hotfixes-unstable branch

+ mm-damon-core-fix-commit_ops_filters-by-using-correct-nth-function.patch added to mm-hotfixes-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/damon/core: fix commit_ops_filters by using correct nth function
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     mm-damon-core-fix-commit_ops_filters-by-using-correct-nth-function.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-core-fix-commit_ops_filters-by-using-correct-nth-function.patch

This patch will later appear in the mm-hotfixes-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Sang-Heon Jeon <ekffu200098@gmail.com>
Subject: mm/damon/core: fix commit_ops_filters by using correct nth function
Date: Sun, 10 Aug 2025 21:42:01 +0900

damos_commit_ops_filters() incorrectly uses damos_nth_filter() which
iterates core_filters.  As a result, performing a commit unintentionally
corrupts ops_filters.

Add damos_nth_ops_filter() which iterates ops_filters.  Use this function
to fix issues caused by wrong iteration.

Link: https://lkml.kernel.org/r/20250810124201.15743-1-ekffu200098@gmail.com
Fixes: 3607cc590f18 ("mm/damon/core: support committing ops_filters") # 6.15.x
Signed-off-by: Sang-Heon Jeon <ekffu200098@gmail.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/core.c |   14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

--- a/mm/damon/core.c~mm-damon-core-fix-commit_ops_filters-by-using-correct-nth-function
+++ a/mm/damon/core.c
@@ -845,6 +845,18 @@ static struct damos_filter *damos_nth_fi
 	return NULL;
 }
 
+static struct damos_filter *damos_nth_ops_filter(int n, struct damos *s)
+{
+	struct damos_filter *filter;
+	int i = 0;
+
+	damos_for_each_ops_filter(filter, s) {
+		if (i++ == n)
+			return filter;
+	}
+	return NULL;
+}
+
 static void damos_commit_filter_arg(
 		struct damos_filter *dst, struct damos_filter *src)
 {
@@ -908,7 +920,7 @@ static int damos_commit_ops_filters(stru
 	int i = 0, j = 0;
 
 	damos_for_each_ops_filter_safe(dst_filter, next, dst) {
-		src_filter = damos_nth_filter(i++, src);
+		src_filter = damos_nth_ops_filter(i++, src);
 		if (src_filter)
 			damos_commit_filter(dst_filter, src_filter);
 		else
_

Patches currently in -mm which might be from ekffu200098@gmail.com are

mm-damon-core-fix-commit_ops_filters-by-using-correct-nth-function.patch
mm-damon-update-expired-description-of-damos_action.patch
docs-mm-damon-design-fix-typo-s-sz_trtied-sz_tried.patch