fix for crash drawing zero length motion path and a leak with zero length paths.

2 files changed, 11 insertions, 2 deletions

diff --git a/source/blender/blenkernel/intern/anim.c b/source/blender/blenkernel/intern/anim.c
index 1763866c000..0747d87a0ab 100644
--- a/source/blender/blenkernel/intern/anim.c
+++ b/source/blender/blenkernel/intern/anim.c
@@ -171,7 +171,12 @@ bMotionPath *animviz_verify_motionpaths(Scene *scene, Object *ob, bPoseChannel *
 		avs= &ob->avs;
 		dst= &ob->mpath;
 	}
-	
+
+	/* avoid 0 size allocs */
+	if(avs->path_sf >= avs->path_ef) {
+		return NULL;
+	}
+
 	/* if there is already a motionpath, just return that,
 	 * but provided it's settings are ok 
 	 */
diff --git a/source/blender/editors/space_view3d/drawanimviz.c b/source/blender/editors/space_view3d/drawanimviz.c
index ee78fd92b79..aa3ba1a3062 100644
--- a/source/blender/editors/space_view3d/drawanimviz.c
+++ b/source/blender/editors/space_view3d/drawanimviz.c
@@ -117,7 +117,11 @@ void draw_motion_path_instance(Scene *scene,
 		len = mpath->length;
 		mpv_start= mpath->points;
 	}
-	
+
+	if(len <= 0) {
+		return;
+	}
+
 	/* draw curve-line of path */
 	glShadeModel(GL_SMOOTH);