- bug fix, hook deform could crash because old files can have hook

indices that are out of range
 - bug fix, hook indicies were not corrected on exit editmode (there
   probably should be a general interface for this kind of patch)

source/blender/blenkernel/intern/modifier.c

@@ -1136,7 +1136,15 @@ static void hookModifier_deformVerts(ModifierData *md, Object *ob, void *derived
 	Mat4MulSerie(mat, ob->imat, hmd->object->obmat, hmd->parentinv, NULL, NULL, NULL, NULL, NULL);
 
 	for (i=0; i<hmd->totindex; i++) {
-		float *co = vertexCos[hmd->indexar[i]];
+		int index = hmd->indexar[i];
+
+			/* These should always be true and I don't generally like 
+			 * "paranoid" style code like this, but old files can have
+			 * indices that are out of range because old blender did
+			 * not correct them on exit editmode.
+			 */
+		if (index<numVerts) {
+			float *co = vertexCos[index];
 			float fac = hmd->force;
 
 			if(hmd->falloff!=0.0) {
@@ -1151,6 +1159,7 @@ static void hookModifier_deformVerts(ModifierData *md, Object *ob, void *derived
 			}
 		}
 	}
+}
 
 static void hookModifier_deformVertsEM(ModifierData *md, Object *ob, void *editData, void *derivedData, float (*vertexCos)[3], int numVerts)
 {

source/blender/src/editmesh.c

@@ -52,6 +52,7 @@
 #include "DNA_scene_types.h"
 #include "DNA_view3d_types.h"
 #include "DNA_material_types.h"
+#include "DNA_modifier_types.h"
 #include "DNA_texture_types.h"
 #include "DNA_userdef_types.h"
 
@@ -1194,6 +1195,42 @@ void load_editMesh(void)
 		me->mcol= 0;
 	}
 
+	/* patch hook indices */
+	{
+		Object *ob;
+		ModifierData *md;
+		EditVert *eve, **vertMap = NULL;
+		int i,j;
+
+		for (ob=G.main->object.first; ob; ob=ob->id.next) {
+			for (md=ob->modifiers.first; md; md=md->next) {
+				if (md->type==eModifierType_Hook) {
+					HookModifierData *hmd = (HookModifierData*) md;
+
+					if (!vertMap) {
+						vertMap = MEM_callocN(sizeof(*vertMap)*ototvert, "vertMap");
+
+						for (eve=em->verts.first; eve; eve=eve->next) {
+							if (eve->keyindex!=-1)
+								vertMap[eve->keyindex] = eve;
+						}
+					}
+					
+					for (i=j=0; i<hmd->totindex; i++) {
+						eve = vertMap[hmd->indexar[i]];
+						
+						if (eve) {
+							hmd->indexar[j++] = (long) eve->vn;
+						}
+					}
+
+					hmd->totindex = j;
+				}
+			}
+		}
+
+		if (vertMap) MEM_freeN(vertMap);
+	}
 
 	/* are there keys? */
 	if(me->key) {