+ selftests-cgroup-add-malloc-failures-checks-in-test_memcontrol.patch added to mm-unstable branch

[Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>]

The patch titled
     Subject: selftests: cgroup: add 'malloc' failures checks in test_memcontrol
has been added to the -mm mm-unstable branch.  Its filename is
     selftests-cgroup-add-malloc-failures-checks-in-test_memcontrol.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-cgroup-add-malloc-failures-checks-in-test_memcontrol.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Ivan Orlov <ivan.orlov0322@xxxxxxxxx>
Subject: selftests: cgroup: add 'malloc' failures checks in test_memcontrol
Date: Sun, 26 Feb 2023 16:16:33 +0300

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).

Link: https://lkml.kernel.org/r/20230226131634.34366-1-ivan.orlov0322@xxxxxxxxx
Signed-off-by: Ivan Orlov <ivan.orlov0322@xxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Acked-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Acked-by: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Zefan Li <lizefan.x@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---


--- a/tools/testing/selftests/cgroup/test_memcontrol.c~selftests-cgroup-add-malloc-failures-checks-in-test_memcontrol
+++ a/tools/testing/selftests/cgroup/test_memcontrol.c
@@ -98,6 +98,11 @@ static int alloc_anon_50M_check(const ch
 	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
 	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(con
 	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;
 
_

Patches currently in -mm which might be from ivan.orlov0322@xxxxxxxxx are

selftests-cgroup-add-malloc-failures-checks-in-test_memcontrol.patch