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wmadec: Verify bitstream size makes sense before calling init_get_bits.

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Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
This commit is contained in:
Alex Converse 2012-01-27 14:24:07 -08:00
parent ae35210a5d
commit 48f1e5212c
1 changed files with 2 additions and 0 deletions
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libavcodec/wmadec.c
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@ -873,6 +873,8 @@ static int wma_decode_superframe(AVCodecContext *avctx, void *data,
/* read each frame starting from bit_offset */
pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8)
return AVERROR_INVALIDDATA;
init_get_bits(&s->gb, buf + (pos >> 3), (MAX_CODED_SUPERFRAME_SIZE - (pos >> 3))*8);
len = pos & 7;
if (len > 0)