Fix double free error

2 files changed, 5 insertions, 1 deletions

diff --git a/node.c b/node.c
index fbbfd14..586ed52 100644
--- a/node.c
+++ b/node.c
@@ -47,7 +47,10 @@ node *n;
 {
 	node *tmp;
 
-	for(tmp = n; tmp; tmp = n = n->next) {
+	for(tmp = n; tmp;) {
+		n = tmp->next;
 		free(tmp);
+		tmp = NULL;
+		tmp = n;
 	}
 }
diff --git a/scope.c b/scope.c
index 11a9c5b..6706765 100644
--- a/scope.c
+++ b/scope.c
@@ -35,6 +35,7 @@ scope *s;
 	}
 
 	free(s);
+	s = NULL;
 }
 
 /*Copied from Compilers, Aho*/