[FFmpeg-cvslog] rsd: limit number of channels

[Andreas Cadhalpun]

ffmpeg | branch: release/3.1 | Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com> | Wed Oct 19 23:40:41 2016 +0200| [13f032abbb26c7b47d700745f7ace05375eae34f] | committer: Andreas Cadhalpun

rsd: limit number of channels

Negative values don't make sense and too large values can cause
overflows. For AV_CODEC_ID_ADPCM_THP this leads to a too small extradata
buffer being allocated, causing out-of-bounds writes.

Reviewed-by: Michael Niedermayer <michael at niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
(cherry picked from commit ee5f0f1d355fa0fd9194ac97a2c8598c93ed328b)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=13f032abbb26c7b47d700745f7ace05375eae34f
---

 libavformat/rsd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavformat/rsd.c b/libavformat/rsd.c
index ee6fdfb..5a56e72 100644
--- a/libavformat/rsd.c
+++ b/libavformat/rsd.c
@@ -84,8 +84,10 @@ static int rsd_read_header(AVFormatContext *s)
     }
 
     par->channels = avio_rl32(pb);
-    if (!par->channels)
+    if (par->channels <= 0 || par->channels > INT_MAX / 36) {
+        av_log(s, AV_LOG_ERROR, "Invalid number of channels: %d\n", par->channels);
         return AVERROR_INVALIDDATA;
+    }
 
     avio_skip(pb, 4); // Bit depth
     par->sample_rate = avio_rl32(pb);