libavcodec/vp9dsp.c:639: error: Buffer Overrun L2
  Offset added: [0, 30] (⇐ [0, 15] + [0, 15]) Size: 15.

libavcodec/vp9dsp.c:639:1: <Offset trace>
637. 
638. def_diag_downleft(8)
639. def_diag_downleft(16)
     ^
640. def_diag_downleft(32)
641. 

libavcodec/vp9dsp.c:639:1: Assignment
637. 
638. def_diag_downleft(8)
639. def_diag_downleft(16)
     ^
640. def_diag_downleft(32)
641. 

libavcodec/vp9dsp.c:639:1: <Length trace>
637. 
638. def_diag_downleft(8)
639. def_diag_downleft(16)
     ^
640. def_diag_downleft(32)
641. 

libavcodec/vp9dsp.c:639:1: Array declaration
637. 
638. def_diag_downleft(8)
639. def_diag_downleft(16)
     ^
640. def_diag_downleft(32)
641. 

libavcodec/vp9dsp.c:639:1: Array access: Offset added: [0, 30] (⇐ [0, 15] + [0, 15]) Size: 15
637. 
638. def_diag_downleft(8)
639. def_diag_downleft(16)
     ^
640. def_diag_downleft(32)
641. 
