From c657588658cf00b50024d973d67401c2a57652b4 Mon Sep 17 00:00:00 2001
From: helixhorned <helixhorned@1a8010ca-5511-0410-912e-c29ae57300e0>
Date: Thu, 26 Jan 2012 21:57:51 +0000
Subject: [PATCH] Fix a potential sector[-1] access when drawing a masked wall
 in Polymost.

git-svn-id: https://svn.eduke32.com/eduke32@2280 1a8010ca-5511-0410-912e-c29ae57300e0
---
 polymer/eduke32/build/src/polymost.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/polymer/eduke32/build/src/polymost.c b/polymer/eduke32/build/src/polymost.c
index 96d755d80..124bf92bb 100644
--- a/polymer/eduke32/build/src/polymost.c
+++ b/polymer/eduke32/build/src/polymost.c
@@ -4550,6 +4550,10 @@ void polymost_drawrooms()
 
     numscans = numbunches = 0;
 
+    // MASKWALL_BAD_ACCESS
+    // Fixes access of stale maskwall[maskwallcnt] (a "scan" index, in BUILD lingo):
+    maskwallcnt = 0;
+
     if (globalcursectnum >= MAXSECTORS)
         globalcursectnum -= MAXSECTORS;
     else
@@ -4624,6 +4628,11 @@ void polymost_drawmaskwall(int32_t damaskwallcnt)
     z = maskwall[damaskwallcnt];
     wal = &wall[thewall[z]]; wal2 = &wall[wal->point2];
     sectnum = thesector[z]; sec = &sector[sectnum];
+
+//    if (wal->nextsector < 0) return;
+    // Without MASKWALL_BAD_ACCESS fix:
+    // wal->nextsector is -1, WGR2 SVN Lochwood Hollow (Til' Death L1)  (or trueror1.map)
+
     nsec = &sector[wal->nextsector];
     z1 = max(nsec->ceilingz,sec->ceilingz);
     z2 = min(nsec->floorz,sec->floorz);