selftests: cgroup: Add 'malloc' failures checks in test_memcontrol

[ 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@gmail.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c
index 8833359556f38c0a04627c43cc9003f2e7fc80a1..fe4f9f4302822c80dc8c50c67daaf15fb54200d4 100644 (file)
--- 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;