[FFmpeg-cvslog] vorbisdec: reject rangebits 0 with non-0 partitions

[Andreas Cadhalpun]

ffmpeg | branch: release/2.4 | Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com> | Sun Jan  3 19:11:24 2016 +0100| [bc4332b3fc493aeca9d885ebcd658ae1d417f246] | committer: Andreas Cadhalpun

vorbisdec: reject rangebits 0 with non-0 partitions

This causes non-unique elements in floor_setup->data.t1.list, which
makes the stream undecodable according to the specification.

Reviewed-by: Michael Niedermayer <michael at niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
(cherry picked from commit e7a7b3135a4e5ba4bd2e144444d95a7563f53e9b)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=bc4332b3fc493aeca9d885ebcd658ae1d417f246
---

 libavcodec/vorbisdec.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/vorbisdec.c b/libavcodec/vorbisdec.c
index e28972c..0ef4701 100644
--- a/libavcodec/vorbisdec.c
+++ b/libavcodec/vorbisdec.c
@@ -567,6 +567,11 @@ static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
                 return AVERROR(ENOMEM);
 
             rangebits = get_bits(gb, 4);
+            if (!rangebits && floor_setup->data.t1.partitions) {
+                av_log(vc->avctx, AV_LOG_ERROR,
+                       "A rangebits value of 0 is not compliant with the Vorbis I specification.\n");
+                return AVERROR_INVALIDDATA;
+            }
             rangemax = (1 << rangebits);
             if (rangemax > vc->blocksize[1] / 2) {
                 av_log(vc->avctx, AV_LOG_ERROR,