linux-kernel - [PATCH AUTOSEL 6.1 2/3] selftests: cgroup: Add 'malloc' failures checks in test

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Date:   Fri, 28 Apr 2023 21:59:03 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Ivan Orlov <ivan.orlov0322@...il.com>,
        Muchun Song <songmuchun@...edance.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, hannes@...xchg.org,
        mhocko@...nel.org, tj@...nel.org, lizefan.x@...edance.com,
        shuah@...nel.org, cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 2/3] selftests: cgroup: Add 'malloc' failures checks in test_memcontrol

From: Ivan Orlov <ivan.orlov0322@...il.com>

[ Upstream commit c83f320e55a49abd90629f42a72897afd579e0de ]

There are several 'malloc' calls in test_memcontrol, which can be
unsuccessful. This patch will add 'malloc' failures checking to
give more details about test's fail reasons and avoid possible
undefined behavior during the future null dereference (like the
one in alloc_anon_50M_check_swap function).

Signed-off-by: Ivan Orlov <ivan.orlov0322@...il.com>
Reviewed-by: Muchun Song <songmuchun@...edance.com>
Acked-by: Shakeel Butt <shakeelb@...gle.com>
Acked-by: Roman Gushchin <roman.gushchin@...ux.dev>
Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/testing/selftests/cgroup/test_memcontrol.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c
index 8833359556f38..fe4f9f4302822 100644
--- a/tools/testing/selftests/cgroup/test_memcontrol.c
+++ b/tools/testing/selftests/cgroup/test_memcontrol.c
@@ -98,6 +98,11 @@ static int alloc_anon_50M_check(const char *cgroup, void *arg)
 	int ret = -1;
 
 	buf = malloc(size);
+	if (buf == NULL) {
+		fprintf(stderr, "malloc() failed\n");
+		return -1;
+	}
+
 	for (ptr = buf; ptr < buf + size; ptr += PAGE_SIZE)
 		*ptr = 0;
 
@@ -211,6 +216,11 @@ static int alloc_anon_noexit(const char *cgroup, void *arg)
 	char *buf, *ptr;
 
 	buf = malloc(size);
+	if (buf == NULL) {
+		fprintf(stderr, "malloc() failed\n");
+		return -1;
+	}
+
 	for (ptr = buf; ptr < buf + size; ptr += PAGE_SIZE)
 		*ptr = 0;
 
@@ -759,6 +769,11 @@ static int alloc_anon_50M_check_swap(const char *cgroup, void *arg)
 	int ret = -1;
 
 	buf = malloc(size);
+	if (buf == NULL) {
+		fprintf(stderr, "malloc() failed\n");
+		return -1;
+	}
+
 	for (ptr = buf; ptr < buf + size; ptr += PAGE_SIZE)
 		*ptr = 0;
 
-- 
2.39.2