FAILED: patch "[PATCH] mm/damon/tests/core-kunit: handle alloc failure on" 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 915a2453d824a9b6bf724e3f970d86ae1d092a61
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026010552-thickness-copper-cc49@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

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

From 915a2453d824a9b6bf724e3f970d86ae1d092a61 Mon Sep 17 00:00:00 2001
From: SeongJae Park <[email protected]>
Date: Sat, 1 Nov 2025 11:20:06 -0700
Subject: [PATCH] mm/damon/tests/core-kunit: handle alloc failure on
damon_test_set_attrs()

damon_test_set_attrs() 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.

index 10c9953581ee..b9bd69a57e62 100644
@@ -465,6 +465,9 @@ static void damon_test_set_attrs(struct kunit *test)
 		.sample_interval = 5000, .aggr_interval = 100000,};
 	struct damon_attrs invalid_attrs;
 
+	if (!c)
+		kunit_skip(test, "ctx alloc fail");
+
 	KUNIT_EXPECT_EQ(test, damon_set_attrs(c, &valid_attrs), 0);
 
 	invalid_attrs = valid_attrs;

damon_test_set_attrs() 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.

---
 mm/damon/core-test.h | 3 +++
 1 file changed, 3 insertions(+)

index 6cc8b245586d..454e9e0b525e 100644
@@ -326,6 +326,9 @@ static void damon_test_set_attrs(struct kunit *test)
 		.sample_interval = 5000, .aggr_interval = 100000,};
 	struct damon_attrs invalid_attrs;
 
+	if (!c)
+		kunit_skip(test, "ctx alloc fail");
+
 	KUNIT_EXPECT_EQ(test, damon_set_attrs(c, &valid_attrs), 0);
 
 	invalid_attrs = valid_attrs;

2.47.3