linux-kernel - [PATCH AUTOSEL 5.8 23/27] tools/testing/selftests/cgroup/cgroup_util.c: cg_read

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Date:   Wed, 19 Aug 2020 20:01:12 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Gaurav Singh <gaurav1086@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>, Tejun Heo <tj@...nel.org>,
        Michal Koutn <mkoutny@...e.com>, Roman Gushchin <guro@...com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Chris Down <chris@...isdown.name>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>,
        linux-kselftest@...r.kernel.org
Subject: [PATCH AUTOSEL 5.8 23/27]  tools/testing/selftests/cgroup/cgroup_util.c: cg_read_strcmp: fix null pointer dereference

From: Gaurav Singh <gaurav1086@...il.com>

[ Upstream commit d830020656c5b68ced962ed3cb51a90e0a89d4c4 ]

Haven't reproduced this issue. This PR is does a minor code cleanup.

Signed-off-by: Gaurav Singh <gaurav1086@...il.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Reviewed-by: Andrew Morton <akpm@...ux-foundation.org>
Cc: Shuah Khan <shuah@...nel.org>
Cc: Tejun Heo <tj@...nel.org>
Cc: Michal Koutn <mkoutny@...e.com>
Cc: Roman Gushchin <guro@...com>
Cc: Christian Brauner <christian.brauner@...ntu.com>
Cc: Chris Down <chris@...isdown.name>
Link: http://lkml.kernel.org/r/20200726013808.22242-1-gaurav1086@gmail.com
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/testing/selftests/cgroup/cgroup_util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/cgroup/cgroup_util.c b/tools/testing/selftests/cgroup/cgroup_util.c
index 8a637ca7d73a4..05853b0b88318 100644
--- a/tools/testing/selftests/cgroup/cgroup_util.c
+++ b/tools/testing/selftests/cgroup/cgroup_util.c
@@ -106,7 +106,7 @@ int cg_read_strcmp(const char *cgroup, const char *control,
 
 	/* Handle the case of comparing against empty string */
 	if (!expected)
-		size = 32;
+		return -1;
 	else
 		size = strlen(expected) + 1;
 
-- 
2.25.1