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wmalosslessdec: Reset put bit buffer when num_saved_bits is reset.

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Fixes CVE-2012-2799

CC:libav-stable@libav.org

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Michael Niedermayer 2012-04-14 16:32:56 +02:00 committed by Anton Khirnov
parent d05f72c754
commit d65d834731
1 changed files with 2 additions and 0 deletions
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2
libavcodec/wmalosslessdec.c
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@ -1230,6 +1230,7 @@ static int decode_packet(AVCodecContext *avctx, void *data, int *got_frame_ptr,
* to decode incomplete frames in the s->len_prefix == 0 case. */
s->num_saved_bits = 0;
s->packet_loss = 0;
init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
}
} else {
@ -1282,6 +1283,7 @@ static void flush(AVCodecContext *avctx)
s->next_packet_start = 0;
s->cdlms[0][0].order = 0;
s->frame.nb_samples = 0;
init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
}
AVCodec ff_wmalossless_decoder = {