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vp9_copy_reference_dec: check ref frame index before use

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use get_ref_frame() to ensure a valid frame is retrieved if one exists

Change-Id: I4b116d928e643ee62a991babd4b974037b6b3830
This commit is contained in:
James Zern 2014-08-14 14:56:08 -07:00
parent d4a47a6cc0
commit a07d09ff34
1 changed files with 6 additions and 2 deletions
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8
vp9/decoder/vp9_decoder.c
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@ -123,8 +123,12 @@ vpx_codec_err_t vp9_copy_reference_dec(VP9Decoder *pbi,
* later commit that adds VP9-specific controls for this functionality.
*/
if (ref_frame_flag == VP9_LAST_FLAG) {
const YV12_BUFFER_CONFIG *const cfg =
&cm->frame_bufs[cm->ref_frame_map[0]].buf;
const YV12_BUFFER_CONFIG *const cfg = get_ref_frame(cm, 0);
if (cfg == NULL) {
vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
"No 'last' reference frame");
return VPX_CODEC_ERROR;
}
if (!equal_dimensions(cfg, sd))
vpx_internal_error(&cm->error, VPX_CODEC_ERROR,
"Incorrect buffer dimensions");