[FFmpeg-cvslog] avformat/mov: creation time should be non negative

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu May 25 22:22:55 2023 +0200| [0c78b0dd3b59384a1bebc6bcb89cbca48667cb55] | committer: Michael Niedermayer

avformat/mov: creation time should be non negative

Fixes: signed integer overflow: -9223372036854775808 - 2082844800 cannot be represented in type 'long'
Fixes: 58384/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-6428383700713472

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0c78b0dd3b59384a1bebc6bcb89cbca48667cb55
---

 libavformat/mov.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 9fdeef057e..192e460038 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -1521,6 +1521,10 @@ static void mov_metadata_creation_time(MOVContext *c, AVIOContext *pb, AVDiction
     if (version == 1) {
         time = avio_rb64(pb);
         avio_rb64(pb);
+        if (time < 0) {
+            av_log(c->fc, AV_LOG_DEBUG, "creation_time is negative\n");
+            return;
+        }
     } else {
         time = avio_rb32(pb);
         avio_rb32(pb); /* modification time */