[FFmpeg-cvslog] libopenmpt: add missing avio_read return value check

[Andreas Cadhalpun]

ffmpeg | branch: release/3.2 | Andreas Cadhalpun <andreas.cadhalpun at googlemail.com> | Sun Jan  1 20:27:50 2017 +0100| [41fc098a8612ba1af98ea0713c929a1f32f3ae87] | committer: Michael Niedermayer

libopenmpt: add missing avio_read return value check

This fixes heap-buffer-overflows in libopenmpt caused by interpreting
the negative size value as unsigned size_t.

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
Reviewed-by: Jörn Heusipp <osmanx at problemloesungsmaschine.de>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 367cac7827870054ae3bd6d4517e7b13f4f3f72c)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=41fc098a8612ba1af98ea0713c929a1f32f3ae87
---

 libavformat/libopenmpt.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavformat/libopenmpt.c b/libavformat/libopenmpt.c
index e7091ef..35fd28f 100644
--- a/libavformat/libopenmpt.c
+++ b/libavformat/libopenmpt.c
@@ -82,6 +82,11 @@ static int read_header_openmpt(AVFormatContext *s)
     if (!buf)
         return AVERROR(ENOMEM);
     size = avio_read(s->pb, buf, size);
+    if (size < 0) {
+        av_log(s, AV_LOG_ERROR, "Reading input buffer failed.\n");
+        av_freep(&buf);
+        return size;
+    }
 
     openmpt->module = openmpt_module_create_from_memory(buf, size, openmpt_logfunc, s, NULL);
     av_freep(&buf);