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wmadec: Verify bitstream size makes sense before calling init_get_bits.
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
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@ -873,6 +873,8 @@ static int wma_decode_superframe(AVCodecContext *avctx, void *data,
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/* read each frame starting from bit_offset */
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/* read each frame starting from bit_offset */
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pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
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pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
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if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8)
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return AVERROR_INVALIDDATA;
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init_get_bits(&s->gb, buf + (pos >> 3), (MAX_CODED_SUPERFRAME_SIZE - (pos >> 3))*8);
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init_get_bits(&s->gb, buf + (pos >> 3), (MAX_CODED_SUPERFRAME_SIZE - (pos >> 3))*8);
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len = pos & 7;
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len = pos & 7;
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if (len > 0)
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if (len > 0)
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