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dcadec: Do not check for overreads in auxiliary data 

The auxiliary data length field is not reliable,
and incorrect overread errors could be returned
for valid, real-world bitstreams.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Tim Walker 2015-11-22 00:02:37 +01:00 committed by Luca Barbato
parent c8fa647811
commit c12c085be7
1 changed files with 6 additions and 6 deletions
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12
libavcodec/dcadec.c
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@ -1086,12 +1086,12 @@ static int dca_subframe_footer(DCAContext *s, int base_channel)
align_get_bits(&s->gb); // byte align
skip_bits(&s->gb, 16); // nAUXCRC16
// additional data (reserved, cf. ETSI TS 102 114 V1.4.1)
if ((reserved = (aux_data_end - get_bits_count(&s->gb))) < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"Overread auxiliary data by %d bits\n", -reserved);
return AVERROR_INVALIDDATA;
} else if (reserved) {
/*
* additional data (reserved, cf. ETSI TS 102 114 V1.4.1)
*
* Note: don't check for overreads, aux_data_count can't be trusted.
*/
if ((reserved = (aux_data_end - get_bits_count(&s->gb))) > 0) {
avpriv_request_sample(s->avctx,
"Core auxiliary data reserved content");
skip_bits_long(&s->gb, reserved);