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avcodec/dcadec: Check that the added xch channel isnt already there 

Fixes null pointer dereference
Fixes: signal_sigsegv_369609d_623_cov_2008234281_ES_6.1_16bit.dts
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 7d593495e4)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-12-17 15:33:05 +01:00
parent 3a5b749d7c
commit 5aead5ee05
1 changed files with 4 additions and 0 deletions
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4
libavcodec/dcadec.c
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@ -2360,6 +2360,10 @@ FF_ENABLE_DEPRECATION_WARNINGS
#else
if (s->xch_present && !s->xch_disable) {
#endif
if (avctx->channel_layout & AV_CH_BACK_CENTER) {
avpriv_request_sample(avctx, "XCh with Back center channel");
return AVERROR_INVALIDDATA;
}
avctx->channel_layout |= AV_CH_BACK_CENTER;
if (s->lfe) {
avctx->channel_layout |= AV_CH_LOW_FREQUENCY;