Support Etymonix MPEG-2 video codec, fixes issue 1603.

[ffmpeg] / libavformat / 4xm.c

diff --git a/libavformat/4xm.c b/libavformat/4xm.c
index 513f51845abfe0979d899dc6dce3e6771fbb035c..631f8216a55157d8ce19fa3bed46221355e0e98a 100644 (file)
--- a/libavformat/4xm.c
+++ b/libavformat/4xm.c
@@ -20,7 +20,7 @@
  */
 
 /**
- * @file 4xm.c
+ * @file libavformat/4xm.c
  * 4X Technologies file demuxer
  * by Mike Melanson (melanson@pcisys.net)
  * for more information on the .4xm file format, visit:
@@ -166,12 +166,13 @@ static int fourxm_read_header(AVFormatContext *s,
                 goto fail;
             }
             current_track = AV_RL32(&header[i + 8]);
+            if((unsigned)current_track >= UINT_MAX / sizeof(AudioTrack) - 1){
+                av_log(s, AV_LOG_ERROR, "current_track too large\n");
+                ret= -1;
+                goto fail;
+            }
             if (current_track + 1 > fourxm->track_count) {
                 fourxm->track_count = current_track + 1;
-                if((unsigned)fourxm->track_count >= UINT_MAX / sizeof(AudioTrack)){
-                    ret= -1;
-                    goto fail;
-                }
                 fourxm->tracks = av_realloc(fourxm->tracks,
                     fourxm->track_count * sizeof(AudioTrack));
                 if (!fourxm->tracks) {