[#18277] Segfault crash by editing mesh with subsurf+ParticleInstance modifiers

particleInstanceModifier_applyModifier uses getVertCo,which is not implemented by ccgDM.

getVertCo was used to simply perform a min/max, so it was fixed to use the apropriate min/max
		dm->getMinMax(dm, min_r, max_r);


Maybe the fact ccgDM doesn't implements getVertCo/getVertNo is a bug, since it implements every
other DM function and its strange those are left out.

1 files changed, 4 insertions, 13 deletions

diff --git a/source/blender/blenkernel/intern/modifier.c b/source/blender/blenkernel/intern/modifier.c
index 6bdd395a2ac..566a139f72c 100644
--- a/source/blender/blenkernel/intern/modifier.c
+++ b/source/blender/blenkernel/intern/modifier.c
@@ -6380,20 +6380,11 @@ static DerivedMesh * particleInstanceModifier_applyModifier(
 	psys->lattice=psys_get_lattice(ob, psys);
 
 	if(psys->flag & (PSYS_HAIR_DONE|PSYS_KEYED)){
-		float co[3];
-		for(i=0; i< totvert; i++){
-			dm->getVertCo(dm,i,co);
-			if(i==0){
-				min_co=max_co=co[track];
-			}
-			else{
-				if(co[track]<min_co)
-					min_co=co[track];
 
-				if(co[track]>max_co)
-					max_co=co[track];
-			}
-		}
+		float min_r[3], max_r[3];
+		dm->getMinMax(dm, min_r, max_r);		
+		min_co=min_r[track];
+		max_co=max_r[track];
 	}
 
 	result = CDDM_from_template(dm, maxvert,dm->getNumEdges(dm)*totpart,maxface);