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| author | Michael Niedermayer <michael@niedermayer.cc> | 2021-12-04 20:48:54 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-12-16 22:31:13 +0100 |
| commit | 562021e2fd4d74589905d9c566c686394d2b0526 (patch) | |
| tree | 0752689fc76f6f9ec18618fad4725b7a524a249d /libavformat | |
| parent | bf1e93bdc9aaa4fd5c231030b5368aae0df018ee (diff) | |
| download | ffmpeg-562021e2fd4d74589905d9c566c686394d2b0526.tar.gz | |
avformat/mov: Check next offset in mov_read_dref()
Fixes: signed integer overflow: 9223372036200463215 + 1109914409 cannot be represented in type 'long'
Fixes: 41480/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-6553086177443840
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavformat')
| -rw-r--r-- | libavformat/mov.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/libavformat/mov.c b/libavformat/mov.c index 9ebfa0bcc7..2aed6e80ef 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -610,11 +610,13 @@ static int mov_read_dref(MOVContext *c, AVIOContext *pb, MOVAtom atom) for (i = 0; i < entries; i++) { MOVDref *dref = &sc->drefs[i]; uint32_t size = avio_rb32(pb); - int64_t next = avio_tell(pb) + size - 4; + int64_t next = avio_tell(pb); - if (size < 12) + if (size < 12 || next < 0 || next > INT64_MAX - size) return AVERROR_INVALIDDATA; + next += size - 4; + dref->type = avio_rl32(pb); avio_rb32(pb); // version + flags |