FAILED: patch "[PATCH] mm/damon/tests/core-kunit: handle allocation failures in" failed to apply to 6.6-stable tree

FAILED: patch "[PATCH] mm/damon/tests/core-kunit: handle allocation failures in" failed to apply to 6.6-stable tree

[gregkh]

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 <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-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x e16fdd4f754048d6e23c56bd8d920b71e41e3777
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026010522-unrelated-secluded-4f8f@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

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

From e16fdd4f754048d6e23c56bd8d920b71e41e3777 Mon Sep 17 00:00:00 2001
From: SeongJae Park <sj@kernel.org>
Date: Sat, 1 Nov 2025 11:19:56 -0700
Subject: [PATCH] mm/damon/tests/core-kunit: handle allocation failures in
 damon_test_regions()

damon_test_regions() is assuming all dynamic memory allocation in it will
succeed.  Those are indeed likely in the real use cases since those
allocations are too small to fail, but theoretically those could fail.  In
the case, inappropriate memory access can happen.  Fix it by appropriately
cleanup pre-allocated memory and skip the execution of the remaining tests
in the failure cases.

Link: https://lkml.kernel.org/r/20251101182021.74868-3-sj@kernel.org
Fixes: 17ccae8bb5c9 ("mm/damon: add kunit tests")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@google.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: <stable@vger.kernel.org>	[5.15+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index 69ca44f9270b..a2c9ee7a5de1 100644
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -20,11 +20,17 @@ static void damon_test_regions(struct kunit *test)
 	struct damon_target *t;
 
 	r = damon_new_region(1, 2);
+	if (!r)
+		kunit_skip(test, "region alloc fail");
 	KUNIT_EXPECT_EQ(test, 1ul, r->ar.start);
 	KUNIT_EXPECT_EQ(test, 2ul, r->ar.end);
 	KUNIT_EXPECT_EQ(test, 0u, r->nr_accesses);
 
 	t = damon_new_target();
+	if (!t) {
+		damon_free_region(r);
+		kunit_skip(test, "target alloc fail");
+	}
 	KUNIT_EXPECT_EQ(test, 0u, damon_nr_regions(t));
 
 	damon_add_region(r, t);

[PATCH 6.6.y] mm/damon/tests/core-kunit: handle allocation failures in damon_test_regions()

[SeongJae Park]

damon_test_regions() is assuming all dynamic memory allocation in it will
succeed.  Those are indeed likely in the real use cases since those
allocations are too small to fail, but theoretically those could fail.  In
the case, inappropriate memory access can happen.  Fix it by appropriately
cleanup pre-allocated memory and skip the execution of the remaining tests
in the failure cases.

Link: https://lkml.kernel.org/r/20251101182021.74868-3-sj@kernel.org
Fixes: 17ccae8bb5c9 ("mm/damon: add kunit tests")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@google.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: <stable@vger.kernel.org>	[5.15+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
(cherry picked from commit e16fdd4f754048d6e23c56bd8d920b71e41e3777)
---
 mm/damon/core-test.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/damon/core-test.h b/mm/damon/core-test.h
index 6cc8b245586d..23a6d3ae9aed 100644
--- a/mm/damon/core-test.h
+++ b/mm/damon/core-test.h
@@ -20,11 +20,17 @@ static void damon_test_regions(struct kunit *test)
 	struct damon_target *t;
 
 	r = damon_new_region(1, 2);
+	if (!r)
+		kunit_skip(test, "region alloc fail");
 	KUNIT_EXPECT_EQ(test, 1ul, r->ar.start);
 	KUNIT_EXPECT_EQ(test, 2ul, r->ar.end);
 	KUNIT_EXPECT_EQ(test, 0u, r->nr_accesses);
 
 	t = damon_new_target();
+	if (!t) {
+		damon_free_region(r);
+		kunit_skip(test, "target alloc fail");
+	}
 	KUNIT_EXPECT_EQ(test, 0u, damon_nr_regions(t));
 
 	damon_add_region(r, t);
-- 
2.47.3

[PATCH 6.6.y] mm/damon/tests/core-kunit: handle allocation failures in damon_test_regions()

[Sasha Levin]

From: SeongJae Park <sj@kernel.org>

[ Upstream commit e16fdd4f754048d6e23c56bd8d920b71e41e3777 ]

damon_test_regions() is assuming all dynamic memory allocation in it will
succeed.  Those are indeed likely in the real use cases since those
allocations are too small to fail, but theoretically those could fail.  In
the case, inappropriate memory access can happen.  Fix it by appropriately
cleanup pre-allocated memory and skip the execution of the remaining tests
in the failure cases.

Link: https://lkml.kernel.org/r/20251101182021.74868-3-sj@kernel.org
Fixes: 17ccae8bb5c9 ("mm/damon: add kunit tests")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@google.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: <stable@vger.kernel.org>	[5.15+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 mm/damon/core-test.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/damon/core-test.h b/mm/damon/core-test.h
index 6cc8b245586d..23a6d3ae9aed 100644
--- a/mm/damon/core-test.h
+++ b/mm/damon/core-test.h
@@ -20,11 +20,17 @@ static void damon_test_regions(struct kunit *test)
 	struct damon_target *t;
 
 	r = damon_new_region(1, 2);
+	if (!r)
+		kunit_skip(test, "region alloc fail");
 	KUNIT_EXPECT_EQ(test, 1ul, r->ar.start);
 	KUNIT_EXPECT_EQ(test, 2ul, r->ar.end);
 	KUNIT_EXPECT_EQ(test, 0u, r->nr_accesses);
 
 	t = damon_new_target();
+	if (!t) {
+		damon_free_region(r);
+		kunit_skip(test, "target alloc fail");
+	}
 	KUNIT_EXPECT_EQ(test, 0u, damon_nr_regions(t));
 
 	damon_add_region(r, t);
-- 
2.51.0