From 8efb681cdae11f1e2ae0a68c96056a164e204008 Mon Sep 17 00:00:00 2001
From: Jan Maria Matejka <mq@ucw.cz>
Date: Thu, 31 May 2018 11:27:34 +0200
Subject: [PATCH] Filter: Avoid calling interpret() on NULL in IF

---
 filter/filter.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/filter/filter.c b/filter/filter.c
index 47fb81e8..3fa3d34c 100644
--- a/filter/filter.c
+++ b/filter/filter.c
@@ -900,12 +900,14 @@ interpret(struct f_inst *what)
     break;
   case FI_CONDITION:
     ARG(1, T_BOOL);
-    if (v1.val.i) {
+    if (v1.val.i && what->a2.p) {
       ARG_ANY(2);
-    } else {
-      ARG_ANY(3);
+      break;
+    }
+    if ((!v1.val.i) && what->a3.p) {
+      ARG_ANY(3);
+      break;
     }
-    break;
   case FI_NOP:
     debug( "No operation\n" );
     break;