[FFmpeg-cvslog] atrac3: fix buffer size for get_bits.

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Sat Jan 26 04:27:23 2013 +0100| [c8f25cafd2f23662bcb1e62965c0c42d6989688a] | committer: Michael Niedermayer

atrac3: fix buffer size for get_bits.

Fixes out of array reads

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c8f25cafd2f23662bcb1e62965c0c42d6989688a
---

 libavcodec/atrac3.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/atrac3.c b/libavcodec/atrac3.c
index 84c5c11..1e54784 100644
--- a/libavcodec/atrac3.c
+++ b/libavcodec/atrac3.c
@@ -740,7 +740,7 @@ static int decode_frame(AVCodecContext *avctx, const uint8_t *databuf,
 
 
         /* set the bitstream reader at the start of the second Sound Unit*/
-        init_get_bits(&q->gb, ptr1, avctx->block_align * 8);
+        init_get_bits8(&q->gb, ptr1, q->decoded_bytes_buffer + avctx->block_align - ptr1);
 
         /* Fill the Weighting coeffs delay buffer */
         memmove(q->weighting_delay, &q->weighting_delay[2],