From 93acd46e25feb36f578e351c44e52e4aed21a1ec Mon Sep 17 00:00:00 2001
From: Powerbyte7 <40431794+Powerbyte7@users.noreply.github.com>
Date: Tue, 17 Dec 2024 20:29:53 +0100
Subject: [PATCH] Fix segfault when using ANY

If port is null, the program attempts to read at an illegal address with port->ip. This check prevents a segfault from occurring.
---
 src/node.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/node.c b/src/node.c
index 8694605..fcd93fc 100644
--- a/src/node.c
+++ b/src/node.c
@@ -224,9 +224,11 @@ static inline Node *node_get_output_port(Node *n, int direction)
     LocationDirection dirs[] = {UP,LEFT,RIGHT,DOWN};
     for(int i=0; i < 4; i++) {
       Node *port = n->ports[dirs[i]];
-      Instruction *inst = &port->instructions[port->ip];
-      if (port && inst->operation == MOV && inst->src_type == ADDRESS && (inst->src.direction == ANY || port->ports[inst->src.direction] == n) ) {
-        return port;
+      if (port) {
+        Instruction *inst = &port->instructions[port->ip];
+        if (inst->operation == MOV && inst->src_type == ADDRESS && (inst->src.direction == ANY || port->ports[inst->src.direction] == n) ) {
+          return port;
+        }
       }
     }
     return NULL;