[FFmpeg-cvslog] alac: Reject rice_limit 0 if compression is used

[Andreas Cadhalpun]

ffmpeg | branch: release/2.4 | Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com> | Fri Apr 24 00:01:43 2015 +0200| [cb5324200ccdc693dd5b28dcd7d4b722fad83ea2] | committer: Vittorio Giovara

alac: Reject rice_limit 0 if compression is used

If in compression mode rice_limit = 0 leads to call
`show_bits(gb, k)` in `decode_scalar` with k = 0.

Request a sample in case it is valid and it should be accepted.

Signed-off-by: Luca Barbato <lu_zero at gentoo.org>

CC: libav-stable at libav.org

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=cb5324200ccdc693dd5b28dcd7d4b722fad83ea2
---

 libavcodec/alac.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libavcodec/alac.c b/libavcodec/alac.c
index 5272f84..5c792c4 100644
--- a/libavcodec/alac.c
+++ b/libavcodec/alac.c
@@ -307,6 +307,12 @@ static int decode_element(AVCodecContext *avctx, AVFrame *frame, int ch_index,
         int lpc_quant[2];
         int rice_history_mult[2];
 
+        if (!alac->rice_limit) {
+            avpriv_request_sample(alac->avctx,
+                                  "Compression with rice limit 0");
+            return AVERROR(ENOSYS);
+        }
+
         decorr_shift       = get_bits(&alac->gb, 8);
         decorr_left_weight = get_bits(&alac->gb, 8);