src/utils_llist.c: Improved robustness against NULL pointers.

[collectd.git] / src / utils_llist.c

diff --git a/src/utils_llist.c b/src/utils_llist.c
index 7fae025..bf5f7e4 100644 (file)
--- a/src/utils_llist.c
+++ b/src/utils_llist.c
@@ -59,6 +59,9 @@ void llist_destroy (llist_t *l)
        llentry_t *e_this;
        llentry_t *e_next;
 
+       if (l == NULL)
+               return;
+
        for (e_this = l->head; e_this != NULL; e_this = e_next)
        {
                e_next = e_this->next;
@@ -140,6 +143,9 @@ llentry_t *llist_search (llist_t *l, const char *key)
 {
        llentry_t *e;
 
+       if (l == NULL)
+               return (NULL);
+
        for (e = l->head; e != NULL; e = e->next)
                if (strcmp (key, e->key) == 0)
                        break;
@@ -149,10 +155,14 @@ llentry_t *llist_search (llist_t *l, const char *key)
 
 llentry_t *llist_head (llist_t *l)
 {
+       if (l == NULL)
+               return (NULL);
        return (l->head);
 }
 
 llentry_t *llist_tail (llist_t *l)
 {
+       if (l == NULL)
+               return (NULL);
        return (l->tail);
 }