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Fix a heap-buffer-overflow

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In some case, what left to read from ptr is smaller than EXTRABYTES.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Thierry Foucu 2012-01-25 15:46:14 -08:00 committed by Michael Niedermayer
parent 3c5fe5b527
commit 10e9d1f76b
1 changed files with 2 additions and 1 deletions
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libavcodec/mpegaudiodec.c
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@ -1385,7 +1385,8 @@ static int mp_decode_layer3(MPADecodeContext *s)
av_dlog(s->avctx, "seekback: %d\n", main_data_begin);
//av_log(NULL, AV_LOG_ERROR, "backstep:%d, lastbuf:%d\n", main_data_begin, s->last_buf_size);
memcpy(s->last_buf + s->last_buf_size, ptr, EXTRABYTES);
memcpy(s->last_buf + s->last_buf_size, ptr,
FFMIN(EXTRABYTES, (s->gb.size_in_bits - get_bits_count(&s->gb))>>3));
s->in_gb = s->gb;
init_get_bits(&s->gb, s->last_buf, s->last_buf_size*8);
#if !UNCHECKED_BITSTREAM_READER