From 46f39b725c3337b038680b20bcea00d277cb2419 Mon Sep 17 00:00:00 2001
From: helixhorned <helixhorned@1a8010ca-5511-0410-912e-c29ae57300e0>
Date: Mon, 4 Jul 2016 14:09:05 +0000
Subject: [PATCH] engine.c: fix potential smostwall[-1] access. Found by ASan.

git-svn-id: https://svn.eduke32.com/eduke32@5807 1a8010ca-5511-0410-912e-c29ae57300e0
---
 polymer/eduke32/build/src/engine.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/polymer/eduke32/build/src/engine.c b/polymer/eduke32/build/src/engine.c
index c8d63ab79..ae07b4f02 100644
--- a/polymer/eduke32/build/src/engine.c
+++ b/polymer/eduke32/build/src/engine.c
@@ -5867,8 +5867,9 @@ static void drawmaskwall(int16_t damaskwallcnt)
     setup_globals_wall1(wal, wal->overpicnum);
     setup_globals_wall2(wal, sec->visibility, z1, z2);
 
-    for (int i=smostwallcnt-1, j=smostwall[i]; i>=0; j=smostwall[--i])
+    for (int i=smostwallcnt-1; i>=0; i--)
     {
+        int j=smostwall[i];
         if ((xb1[j] > xb2[z]) || (xb2[j] < xb1[z])) continue;
         if (wallfront(j,z)) continue;