[Bf-blender-cvs] [482823a] master: Fix T38435: Crash when pressing MMB in walk mode

[Bastien Montagne]

Commit: 482823a1abc4e1fae7d010940b6b4bc867205f0d
Author: Bastien Montagne
Date:   Sun Feb 2 20:34:23 2014 +0100
https://developer.blender.org/rB482823a1abc4e1fae7d010940b6b4bc867205f0d

Fix T38435: Crash when pressing MMB in walk mode

Snap code may be called with a NULL region, add check about this and assume ray_start is OK in this case!

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M	source/blender/editors/transform/transform_snap.c

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diff --git a/source/blender/editors/transform/transform_snap.c b/source/blender/editors/transform/transform_snap.c
index 9f48dc8..4499a9a 100644
--- a/source/blender/editors/transform/transform_snap.c
+++ b/source/blender/editors/transform/transform_snap.c
@@ -1542,8 +1542,9 @@ static bool snapDerivedMesh(short snap_mode, ARegion *ar, Object *ob, DerivedMes
 
 				/* Only use closer ray_start in case of ortho view! In perspective one, ray_start may already
 				 * been *inside* boundbox, leading to snap failures (see T38409).
+				 * Note also ar might be null (see T38435), in this case we assume ray_start is ok!
 				 */
-				if (!((RegionView3D *)ar->regiondata)->is_persp) {
+				if (ar && !((RegionView3D *)ar->regiondata)->is_persp) {
 					float ray_org_local[3];
 
 					copy_v3_v3(ray_org_local, ray_origin);