From 0c78b0dd3b59384a1bebc6bcb89cbca48667cb55 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Thu, 25 May 2023 22:22:55 +0200 Subject: [PATCH] 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 --- 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 */