prune_init_cgroup: don't dereference NULL

This is to avoid: https://errors.ubuntu.com/problem/d640a68bf7343705899d7ca8c6bc070d477cd845Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

prune_init_cgroup: don't dereference NULL
763c777b · Serge Hallyn · Stéphane Graber · d529ba02 · 763c777b
Commit 763c777b authored Dec 04, 2015 by Serge Hallyn Committed by Stéphane Graber Nov 17, 2016
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cgroup.c src/lxc/cgroup.c +6 -1

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--- a/src/lxc/cgroup.c
+++ b/src/lxc/cgroup.c
@@ -177,7 +177,12 @@ void cgroup_disconnect(void)
 #define INIT_SCOPE "/init.scope"
 void prune_init_scope(char *cg)
 {
-	char *point = cg + strlen(cg) - strlen(INIT_SCOPE);
+	char *point;
+
+	if (!cg)
+		return;
+
+	point = cg + strlen(cg) - strlen(INIT_SCOPE);
 	if (point < cg)
 		return;
 	if (strcmp(point, INIT_SCOPE) == 0) {