From: divverent <divverent@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Tue, 12 Apr 2011 20:05:04 +0000 (+0000)
Subject: avoid some crashes when recursing BIHs
X-Git-Tag: xonotic-v0.5.0~272
X-Git-Url: https://git.rm.cloudns.org/?a=commitdiff_plain;h=cf27f93fcf5962857fe8ec95536271eb396bd993;p=xonotic%2Fdarkplaces.git

avoid some crashes when recursing BIHs

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@11054 d7cf8633-e32d-0410-b094-e92efae38249
::stable-branch::merge=97a3d9fc989eccece0d7b730473762180cecfab1
---

diff --git a/model_brush.c b/model_brush.c
index 37285c6b..1051d280 100644
--- a/model_brush.c
+++ b/model_brush.c
@@ -5991,6 +5991,9 @@ void Mod_CollisionBIH_TracePoint(dp_model_t *model, const frameblend_t *frameble
 	trace->hitsupercontentsmask = hitsupercontentsmask;
 
 	bih = &model->collision_bih;
+	if(!bih->nodes)
+		return;
+
 	nodenum = bih->rootnode;
 	nodestack[nodestackpos++] = nodenum;
 	while (nodestackpos)
@@ -6047,6 +6050,9 @@ void Mod_CollisionBIH_TraceLineShared(dp_model_t *model, const frameblend_t *fra
 	vec_t d1, d2, d3, d4, f, nodestackline[1024][6];
 	int axis, nodenum, nodestackpos = 0, nodestack[1024];
 
+	if(!bih->nodes)
+		return;
+
 	if (VectorCompare(start, end))
 	{
 		Mod_CollisionBIH_TracePoint(model, frameblend, skeleton, trace, start, hitsupercontentsmask);
@@ -6180,6 +6186,8 @@ void Mod_CollisionBIH_TraceBrush(dp_model_t *model, const frameblend_t *frameble
 	}
 
 	bih = &model->collision_bih;
+	if(!bih->nodes)
+		return;
 	nodenum = bih->rootnode;
 
 	// box trace, performed as brush trace