From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4025B2E540C; Tue, 6 Jan 2026 02:23:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767666208; cv=none; b=XsZC6/5PWFnDO1yC+rBdB7v4EQ2uKTKtUz9KUDCNj1uLPm3GalmKPhs0OaarEgbFP6YdZJXDaBkt0YhCiSU/FIQZj/syB6pJ/M0F+3CzOPPo//+dZ6EnHco9a3Z6BIoPg1P3FD/nAphVEjNRwJxmi3gC8pjmEE7tOnzvGJUdWRM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767666208; c=relaxed/simple; bh=WHUC4hR8e9vq9/zZ3W3YPDwZO+OJo+oddTcuh1qURRA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PcJ63arYKIPY7MGxj/EC/HzKZVWWmHLHG4sWu+tGS5TiZzqmQYoszIcdSCV5IUIM5nRKLzOrgqp1adzvLIdPvw4g4I+M63RCVtcdm77lyQ9NgGCWwvcw7inZKo01sgQL10EHU/vbSBme8j71lyYozuB3akntfDB5TtlblIHhkFk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LHIKHkuX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LHIKHkuX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9E63FC116D0; Tue, 6 Jan 2026 02:23:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767666207; bh=WHUC4hR8e9vq9/zZ3W3YPDwZO+OJo+oddTcuh1qURRA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LHIKHkuXzRwn/iE/NZYS8WiWQmtDY+bxgiB0JSzSqs2Xh5hR/mGXIvY38dT+8gix/ HJ5siw2+MohYc3ZbZe/zOKCaJuC3niQWhHsk/t2W0bbzTNq/duKzfdArkQwCw0qs0a tJY08+olvGNT41xocoIPLYBFIz6sBAakXH1MFu/qrgmT9cfu4Y9tKi8t09u/uBoDYZ pCAiHzOXyLt+e7h8IQ25HZcXrXqvLLNMhxeJJ8rshRk7xy+B4Ak85WueAhLPB6imwh YeH8ggs7Axv6kvIUxACapa1IjfhBSiQvglEs1H6NeTHuPnLE2VOdcfyXw8q7KNJY4w ApPYfBdIxOo+g== From: SeongJae Park To: stable@vger.kernel.org Cc: damon@lists.linux.dev, SeongJae Park , Brendan Higgins , David Gow , Kefeng Wang , Andrew Morton Subject: [PATCH 5.15.y] mm/damon/tests/core-kunit: handle alloc failures on damon_test_split_at() Date: Mon, 5 Jan 2026 18:23:24 -0800 Message-ID: <20260106022324.674359-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <2026010508-outnumber-condense-f43a@gregkh> References: <2026010508-outnumber-condense-f43a@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit damon_test_split_at() 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/20251101182021.74868-6-sj@kernel.org Fixes: 17ccae8bb5c9 ("mm/damon: add kunit tests") Signed-off-by: SeongJae Park Cc: Brendan Higgins Cc: David Gow Cc: Kefeng Wang Cc: [5.15+] Signed-off-by: Andrew Morton (cherry picked from commit 5e80d73f22043c59c8ad36452a3253937ed77955) Signed-off-by: SeongJae Park --- mm/damon/core-test.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/mm/damon/core-test.h b/mm/damon/core-test.h index 7008c3735e99..ea8f548a556c 100644 --- a/mm/damon/core-test.h +++ b/mm/damon/core-test.h @@ -122,8 +122,19 @@ static void damon_test_split_at(struct kunit *test) struct damon_target *t; struct damon_region *r; + if (!c) + kunit_skip(test, "ctx alloc fail"); t = damon_new_target(42); + if (!t) { + damon_destroy_ctx(c); + kunit_skip(test, "target alloc fail"); + } r = damon_new_region(0, 100); + if (!r) { + damon_destroy_ctx(c); + damon_free_target(t); + kunit_skip(test, "region alloc fail"); + } damon_add_region(r, t); damon_split_region_at(c, t, r, 25); KUNIT_EXPECT_EQ(test, r->ar.start, 0ul); -- 2.47.3