[PATCH] [cgroup/testing] cg_read_strcmp: Fix null pointer dereference

[Gaurav Singh]

Passing NULL in strcmp will cause a segmentation fault.
Fix this by returning -1 if expected is NULL pointer. 

Signed-off-by: Gaurav Singh <gaurav1...@gmail.com>
---
 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 8a637ca7d73a..05853b0b8831 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;
 
-- 
2.17.1