[FFmpeg-cvslog] 4xm: prevent overflow during block alignment calculation

[Andreas Cadhalpun]

ffmpeg | branch: master | Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com> | Thu Dec 15 02:14:31 2016 +0100| [e3f13d3a87274d537d319a84e9104f44f84ec3b2] | committer: Andreas Cadhalpun

4xm: prevent overflow during block alignment calculation

Reviewed-by: Michael Niedermayer <michael at niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e3f13d3a87274d537d319a84e9104f44f84ec3b2
---

 libavformat/4xm.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavformat/4xm.c b/libavformat/4xm.c
index 2758b69..ead6d2b 100644
--- a/libavformat/4xm.c
+++ b/libavformat/4xm.c
@@ -29,6 +29,7 @@
 
 #include "libavutil/intreadwrite.h"
 #include "libavutil/intfloat.h"
+#include "libavcodec/internal.h"
 #include "avformat.h"
 #include "internal.h"
 
@@ -153,8 +154,10 @@ static int parse_strk(AVFormatContext *s,
     fourxm->tracks[track].audio_pts   = 0;
 
     if (fourxm->tracks[track].channels    <= 0 ||
+        fourxm->tracks[track].channels     > FF_SANE_NB_CHANNELS ||
         fourxm->tracks[track].sample_rate <= 0 ||
-        fourxm->tracks[track].bits        <= 0) {
+        fourxm->tracks[track].bits        <= 0 ||
+        fourxm->tracks[track].bits         > INT_MAX / FF_SANE_NB_CHANNELS) {
         av_log(s, AV_LOG_ERROR, "audio header invalid\n");
         return AVERROR_INVALIDDATA;
     }