dhcprelay: new applet

1 files changed, 9 insertions, 0 deletions

diff --git a/networking/ifupdown.c b/networking/ifupdown.c
index ede2f8997..f72e653b3 100644
--- a/networking/ifupdown.c
+++ b/networking/ifupdown.c
@@ -598,6 +598,9 @@ static const struct address_family_t *get_address_family(const struct address_fa
 {
         int i;
 
+        if (!name)
+                return NULL;
+
         for (i = 0; af[i]; i++) {
                 if (strcmp(af[i]->name, name) == 0) {
                         return af[i];
@@ -610,6 +613,9 @@ static const struct method_t *get_method(const struct address_family_t *af, char
 {
         int i;
 
+        if (!name)
+                return NULL;
+
         for (i = 0; i < af->n_methods; i++) {
                 if (strcmp(af->method[i].name, name) == 0) {
                         return &af->method[i];
@@ -620,6 +626,9 @@ static const struct method_t *get_method(const struct address_family_t *af, char
 
 static const llist_t *find_list_string(const llist_t *list, const char *string)
 {
+        if (string == NULL)
+                return NULL;
+
         while (list) {
                 if (strcmp(list->data, string) == 0) {
                         return list;