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| author | Ronald S. Bultje <rsbultje@gmail.com> | 2012-03-29 12:44:55 -0700 |
|---|---|---|
| committer | Ronald S. Bultje <rsbultje@gmail.com> | 2012-05-02 10:16:57 -0700 |
| commit | ac80b812cd177553339467ea12548d71c9ef6865 (patch) | |
| tree | 1c68089fa4c3f7e773a35d95f19dd4dc63990c43 | |
| parent | 77cfb2563c6bc234a354c1694de8a9eb76a309cf (diff) | |
| download | ffmpeg-streaming-ac80b812cd177553339467ea12548d71c9ef6865.zip ffmpeg-streaming-ac80b812cd177553339467ea12548d71c9ef6865.tar.gz | |
tta: prevents overflows for 32bit integers in header.
This prevents sample_rate/data_length from going negative, which
caused various crashes and undefined behaviour further down.
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
| -rw-r--r-- | libavcodec/tta.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/libavcodec/tta.c b/libavcodec/tta.c index acaeaaa..e28023f 100644 --- a/libavcodec/tta.c +++ b/libavcodec/tta.c @@ -61,7 +61,8 @@ typedef struct TTAContext { GetBitContext gb; const AVCRC *crc_table; - int format, channels, bps, data_length; + int format, channels, bps; + unsigned data_length; int frame_length, last_frame_length, total_frames; int32_t *decode_buffer; @@ -253,7 +254,7 @@ static av_cold int tta_decode_init(AVCodecContext * avctx) } // prevent overflow - if (avctx->sample_rate > 0x7FFFFF) { + if (avctx->sample_rate > 0x7FFFFFu) { av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n"); return AVERROR(EINVAL); } @@ -270,7 +271,8 @@ static av_cold int tta_decode_init(AVCodecContext * avctx) s->data_length, s->frame_length, s->last_frame_length, s->total_frames); // FIXME: seek table - if (get_bits_left(&s->gb) < 32 * s->total_frames + 32) + if (avctx->extradata_size <= 26 || s->total_frames > INT_MAX / 4 || + avctx->extradata_size - 26 < s->total_frames * 4) av_log(avctx, AV_LOG_WARNING, "Seek table missing or too small\n"); else if (avctx->err_recognition & AV_EF_CRCCHECK) { if (tta_check_crc(s, avctx->extradata + 22, s->total_frames * 4)) |
