From: Ivan Orlov ivan.orlov0322@gmail.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@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 --- 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 1e616a8c6a9cf..f4f7c0aef702b 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;

@@ -778,6 +788,11 @@ 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;