Fix #36948: blender internal viewport render crashes holding shift+Z pressed

to quickly toggle it on/off.

Problem is accessing freed data, now the job is ended immediately. Fix based
on patch from Sergey and investigation from Bastien.

2 files changed, 23 insertions, 8 deletions

diff --git a/source/blender/editors/space_view3d/space_view3d.c b/source/blender/editors/space_view3d/space_view3d.c
index 6c61c2af816..58c0df6b6bd 100644
--- a/source/blender/editors/space_view3d/space_view3d.c
+++ b/source/blender/editors/space_view3d/space_view3d.c
@@ -44,6 +44,7 @@
 
 #include "BKE_context.h"
 #include "BKE_icons.h"
+#include "BKE_main.h"
 #include "BKE_object.h"
 #include "BKE_screen.h"
 
@@ -258,6 +259,25 @@ void ED_view3d_check_mats_rv3d(struct RegionView3D *rv3d)
 }
 #endif
 
+void ED_view3d_shade_update(Main *bmain, View3D *v3d, ScrArea *sa)
+{
+	wmWindowManager *wm = bmain->wm.first;
+
+	if (v3d->drawtype != OB_RENDER) {
+		ARegion *ar;
+
+		for (ar = sa->regionbase.first; ar; ar = ar->next) {
+			RegionView3D *rv3d = ar->regiondata;
+
+			if (rv3d && rv3d->render_engine) {
+				WM_jobs_kill_type(wm, ar, WM_JOB_TYPE_RENDER_PREVIEW);
+				RE_engine_free(rv3d->render_engine);
+				rv3d->render_engine = NULL;
+			}
+		}
+	}
+}
+
 /* ******************** default callbacks for view3d space ***************** */
 
 static SpaceLink *view3d_new(const bContext *C)
diff --git a/source/blender/editors/space_view3d/view3d_view.c b/source/blender/editors/space_view3d/view3d_view.c
index 388d83d3208..74d72061995 100644
--- a/source/blender/editors/space_view3d/view3d_view.c
+++ b/source/blender/editors/space_view3d/view3d_view.c
@@ -1180,7 +1180,7 @@ static bool view3d_localview_init(Main *bmain, Scene *scene, ScrArea *sa, Report
 	return ok;
 }
 
-static void restore_localviewdata(ScrArea *sa, int free)
+static void restore_localviewdata(Main *bmain, ScrArea *sa, int free)
 {
 	ARegion *ar;
 	View3D *v3d = sa->spacedata.first;
@@ -1217,12 +1217,7 @@ static void restore_localviewdata(ScrArea *sa, int free)
 				}
 			}
 
-			if (v3d->drawtype != OB_RENDER) {
-				if (rv3d->render_engine) {
-					RE_engine_free(rv3d->render_engine);
-					rv3d->render_engine = NULL;
-				}
-			}
+			ED_view3d_shade_update(bmain, v3d, sa);
 		}
 	}
 }
@@ -1237,7 +1232,7 @@ static bool view3d_localview_exit(Main *bmain, Scene *scene, ScrArea *sa)
 		
 		locallay = v3d->lay & 0xFF000000;
 		
-		restore_localviewdata(sa, 1); /* 1 = free */
+		restore_localviewdata(bmain, sa, 1); /* 1 = free */
 
 		/* for when in other window the layers have changed */
 		if (v3d->scenelock) v3d->lay = scene->lay;