Commit 709fecac authored by Adrian Grange's avatar Adrian Grange
Browse files

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
parent bfaf415e
......@@ -1120,6 +1120,12 @@ static size_t read_uncompressed_header(VP9D_COMP *pbi,
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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