avformat/4xm: Make audio_frame_count 64bit

Fixes: signed integer overflow: 2099257366 * 2 cannot be represented in type 'int'
Fixes: 27486/clusterfuzz-testcase-minimized-ffmpeg_dem_FOURXM_fuzzer-5112179134824448
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavformat/4xm.c b/libavformat/4xm.c
index 6a227a0b0d2c81d1931d33e14132129c8f8c4f27..30f1b05324040f3d7aef0fdb3b8a664d63730808 100644 (file)
--- a/libavformat/4xm.c
+++ b/libavformat/4xm.c
@@ -299,7 +299,7 @@ static int fourxm_read_packet(AVFormatContext *s,
     unsigned int track_number;
     int packet_read = 0;
     unsigned char header[8];
-    int audio_frame_count;
+    int64_t audio_frame_count;
 
     while (!packet_read) {
         if ((ret = avio_read(s->pb, header, 8)) < 0)