FAILED: patch "[PATCH] mm/damon/core: disallow max < min damos filter range arguments commit" failed to apply to 6.6-stable tree

The patch below does not apply to the 6.6-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 <[email protected]>.

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-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 1bfb9384ae0ed52d61eb601b655014b7815ff849
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '[email protected]' --subject-prefix 'PATCH 6.6.y' 'HEAD^..'

Thanks,
Sasha

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

From 1bfb9384ae0ed52d61eb601b655014b7815ff849 Mon Sep 17 00:00:00 2001
From: SJ Park <[email protected]>
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.

---
 mm/damon/core.c | 6 ++++++
 1 file changed, 6 insertions(+)

index 1932a50252079..5fdacb9dcee5f 100644
@@ -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