Fix T89374: Erasing/cutting in Grease Pencil makes Blender shut down

When cut a stroke of 1 point, the clean up done to avoid keep 1 point strokes removes the memory, but the pointer to the first stroke was not set to NULL. As this pointer is invalid now, any use of this produces a segment fault because the pointer is corrupted..

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/gpencil_geom.c b/source/blender/blenkernel/intern/gpencil_geom.c
index 7f839650f33..982fc2abd65 100644
--- a/source/blender/blenkernel/intern/gpencil_geom.c
+++ b/source/blender/blenkernel/intern/gpencil_geom.c
@@ -2984,6 +2984,9 @@ bGPDstroke *BKE_gpencil_stroke_delete_tagged_points(bGPdata *gpd,
 
       /* Add new stroke to the frame or delete if below limit */
       if ((limit > 0) && (new_stroke->totpoints <= limit)) {
+        if (gps_first == new_stroke) {
+          gps_first = NULL;
+        }
         BKE_gpencil_free_stroke(new_stroke);
       }
       else {