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avcodec/mpeg12dec: Do not call show_bits() with invalid bits

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Fixes assertion failure
Fixes: 63e50545709a6440d3d59f6426d58db9/signal_sigabrt_7ffff6ae7cc9_8189_3272a3010fd98ddf947c662bbde1ac13.ts

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 973c3dba27)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
This commit is contained in:
Michael Niedermayer 2015-11-06 00:56:04 +01:00 committed by Andreas Cadhalpun
parent 458b1fda34
commit 2ccab79595
1 changed files with 1 additions and 1 deletions
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2
libavcodec/mpeg12dec.c
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@ -1907,7 +1907,7 @@ static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
(left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) { ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
left, show_bits(&s->gb, FFMIN(left, 23))); left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0);
return -1; return -1;
} else } else
goto eos; goto eos;