[FFmpeg-cvslog] dca: Validate the channel map

[Luca Barbato]

ffmpeg | branch: master | Luca Barbato <lu_zero at gentoo.org> | Tue Mar 14 09:15:29 2017 +0000| [e245d4f45ca5e2b97daef5944d63323c07d545bc] | committer: Luca Barbato

dca: Validate the channel map

Having a mismatch between the number of channels in the stream and those
in the channel map will lead to a segfault or worse.

Bug-Id: 1016

CC: libav-stable at libav.org

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e245d4f45ca5e2b97daef5944d63323c07d545bc
---

 libavcodec/dcadec.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/dcadec.c b/libavcodec/dcadec.c
index cd4432368c..af26dceafd 100644
--- a/libavcodec/dcadec.c
+++ b/libavcodec/dcadec.c
@@ -1297,6 +1297,9 @@ static int set_channel_layout(AVCodecContext *avctx, int channels, int num_core_
                 s->channel_order_tab = ff_dca_channel_reorder_nolfe[s->amode];
         }
 
+        if (channels < ff_dca_channels[s->amode])
+            return AVERROR_INVALIDDATA;
+
         if (channels > !!s->lfe &&
             s->channel_order_tab[channels - 1 - !!s->lfe] < 0)
             return AVERROR_INVALIDDATA;