[Bf-blender-cvs] [c1d1c1d] master: Fix T48088: Reproducible crash: Edges + Array Mod + Hair Particles.

[Bastien Montagne]

Commit: c1d1c1dc6b9b1e3d01ea9b8acacd235c1a357500
Author: Bastien Montagne
Date:   Fri Apr 8 16:26:42 2016 +0200
Branches: master
https://developer.blender.org/rBc1d1c1dc6b9b1e3d01ea9b8acacd235c1a357500

Fix T48088: Reproducible crash: Edges + Array Mod + Hair Particles.

Code did not consider the possibility to have no face at all! :P

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

M	source/blender/blenkernel/intern/particle.c

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

diff --git a/source/blender/blenkernel/intern/particle.c b/source/blender/blenkernel/intern/particle.c
index 0b88533..0987004 100644
--- a/source/blender/blenkernel/intern/particle.c
+++ b/source/blender/blenkernel/intern/particle.c
@@ -1422,7 +1422,6 @@ int psys_particle_dm_face_lookup(
 {
 	MFace *mtessface_final;
 	OrigSpaceFace *osface_final;
-	int totface_final;
 	int pindex_orig;
 	float uv[2], (*faceuv)[2];
 
@@ -1430,6 +1429,13 @@ int psys_particle_dm_face_lookup(
 	const int *index_mf_to_mpoly = NULL;
 	const int *index_mp_to_orig = NULL;
 
+	const int totface_final = dm_final->getNumTessFaces(dm_final);
+	const int totface_deformed = dm_deformed ? dm_deformed->getNumTessFaces(dm_deformed) : totface_final;
+
+	if (ELEM(0, totface_final, totface_deformed)) {
+		return DMCACHE_NOTFOUND;
+	}
+
 	index_mf_to_mpoly = dm_final->getTessFaceDataArray(dm_final, CD_ORIGINDEX);
 	index_mp_to_orig = dm_final->getPolyDataArray(dm_final, CD_ORIGINDEX);
 	BLI_assert(index_mf_to_mpoly);
@@ -1451,11 +1457,6 @@ int psys_particle_dm_face_lookup(
 
 	index_mf_to_mpoly_deformed = NULL;
 
-	totface_final = dm_final->getNumTessFaces(dm_final);
-	if (!totface_final) {
-		return DMCACHE_NOTFOUND;
-	}
-
 	mtessface_final = dm_final->getTessFaceArray(dm_final);
 	osface_final = dm_final->getTessFaceDataArray(dm_final, CD_ORIGSPACE);