FAILED: patch "[PATCH] mm/damon/core: disallow max < min damos filter range arguments commit" failed to apply to 6.1-stable tree

FAILED: patch "[PATCH] mm/damon/core: disallow max < min damos filter range arguments commit" failed to apply to 6.1-stable tree

[Sasha Levin]

The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x 1bfb9384ae0ed52d61eb601b655014b7815ff849
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '20261107054701-failed-6.1-1bfb9384ae0e@kernel.org' --subject-prefix 'PATCH 6.1.y' 'HEAD^..'

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From 1bfb9384ae0ed52d61eb601b655014b7815ff849 Mon Sep 17 00:00:00 2001
From: SJ Park <sj@kernel.org>
Date: Mon, 14 Sep 2026 07:23:21 -0700
Subject: [PATCH] mm/damon/core: disallow max < min damos filter range
 arguments commit

damos_commit_filter_arg() receives range arguments for a few types of
DAMOS filters.  It allows any range including max < min range.  It is fine
for the logic, but makes no sense to support it.  Actually DAMON sysfs
interface is doing the validation on its own.  To avoid duplicated
validations in multiple DAMON API callers, it would be better to do the
validation in the core layer.  Add a validation of the given range.

Link: https://lore.kernel.org/20260914142327.92510-5-sj@kernel.org
Signed-off-by: SJ Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@davidgow.net>
Cc: Usama Arif <usamaarif642@gmail.com>
Cc: <stable@vger.kernel.org>
---
 mm/damon/core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index 1932a50252079..5fdacb9dcee5f 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -1325,15 +1325,21 @@ static int damos_commit_filter_arg(
 		dst->memcg_id = src->memcg_id;
 		break;
 	case DAMOS_FILTER_TYPE_ADDR:
+		if (src->addr_range.end < src->addr_range.start)
+			return -EINVAL;
 		dst->addr_range = src->addr_range;
 		break;
 	case DAMOS_FILTER_TYPE_TARGET:
 		dst->target_idx = src->target_idx;
 		break;
 	case DAMOS_FILTER_TYPE_HUGEPAGE_SIZE:
+		if (src->sz_range.max < src->sz_range.min)
+			return -EINVAL;
 		dst->sz_range = src->sz_range;
 		break;
 	case DAMOS_FILTER_TYPE_PROBE_HITS_WSUM:
+		if (src->range_max < src->range_min)
+			return -EINVAL;
 		dst->range_min = src->range_min;
 		dst->range_max = src->range_max;
 		break;
-- 
2.53.0