[Bf-blender-cvs] [dfae3de6bdf] master: Cycles: Fix stack overflow during traversal caused by floating overflow

[Sergey Sharybin]

Commit: dfae3de6bdf5d3e63d34281c840b9e568d0da613
Author: Sergey Sharybin
Date:   Fri Aug 25 14:00:33 2017 +0200
Branches: master
https://developer.blender.org/rBdfae3de6bdf5d3e63d34281c840b9e568d0da613

Cycles: Fix stack overflow during traversal caused by floating overflow

Would be nice to be able to catch this with assert as well, will see what would
be the best way to do this/.\

Need to verify with Mai that this solves crash for her and maybe consider
porting this to 2.79.

===================================================================

M	intern/cycles/bvh/bvh4.cpp

===================================================================

diff --git a/intern/cycles/bvh/bvh4.cpp b/intern/cycles/bvh/bvh4.cpp
index aeedd802f49..777de20423b 100644
--- a/intern/cycles/bvh/bvh4.cpp
+++ b/intern/cycles/bvh/bvh4.cpp
@@ -242,21 +242,21 @@ void BVH4::pack_unaligned_node(int idx,
 		 * so kernel might safely assume there are always 4 child nodes.
 		 */
 
-		data[1][i] = 1.0f;
-		data[2][i] = 0.0f;
-		data[3][i] = 0.0f;
+		data[1][i] = NAN;
+		data[2][i] = NAN;
+		data[3][i] = NAN;
 
-		data[4][i] = 0.0f;
-		data[5][i] = 0.0f;
-		data[6][i] = 0.0f;
+		data[4][i] = NAN;
+		data[5][i] = NAN;
+		data[6][i] = NAN;
 
-		data[7][i] = 0.0f;
-		data[8][i] = 0.0f;
-		data[9][i] = 0.0f;
+		data[7][i] = NAN;
+		data[8][i] = NAN;
+		data[9][i] = NAN;
 
-		data[10][i] = -FLT_MAX;
-		data[11][i] = -FLT_MAX;
-		data[12][i] = -FLT_MAX;
+		data[10][i] = NAN;
+		data[11][i] = NAN;
+		data[12][i] = NAN;
 
 		data[13][i] = __int_as_float(0);
 	}