shithub: libvpx

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Trap request to display non-existant frame

If show_existing_frame indicates that the decoder should
display an existing (previously decoded) frame, add a
check to make sure that the signaled buffer does contain
a valid decoded frame.

Change-Id: Iac8c686b321827414d69a3f2d0467566911bcba2

--- a/vp9/decoder/vp9_decodeframe.c

+++ b/vp9/decoder/vp9_decodeframe.c

@@ -1120,6 +1120,12 @@

   if (cm->show_existing_frame) {

     // Show an existing frame directly.

     const int frame_to_show = cm->ref_frame_map[vp9_rb_read_literal(rb, 3)];

+

+    if (cm->frame_bufs[frame_to_show].ref_count < 1)

+      vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM,

+                         "Buffer %d does not contain a decoded frame",

+                         frame_to_show);

+

     ref_cnt_fb(cm->frame_bufs, &cm->new_fb_idx, frame_to_show);

     pbi->refresh_frame_flags = 0;

     cm->lf.filter_level = 0;

-- 

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