node_list: Fix memory corruption
The corruption occured if you removed the last node from the list
and later add a new node to the list.
diff --git a/libcnary/node_list.c b/libcnary/node_list.c
index 2a9cf90..78f450e 100644
--- a/libcnary/node_list.c
+++ b/libcnary/node_list.c
@@ -59,7 +59,10 @@
node->prev = last;
// Set the next element of our old "last" element
- last->next = node;
+ if (last) {
+ // but only if the node list is not empty
+ last->next = node;
+ }
// Set the lists prev to the new last element
list->end = node;
@@ -129,6 +132,9 @@
node->prev->next = newnode;
if (newnode) {
newnode->prev = node->prev;
+ } else {
+ // last element in the list
+ list->end = node->prev;
}
} else {
// we just removed the first element
