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| author | Michael Niedermayer <michael@niedermayer.cc> | 2023-02-20 19:19:32 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2023-02-22 18:01:37 +0100 |
| commit | 53c1f5c2e28e54ea8174b196d5cf4a158907395a (patch) | |
| tree | 9f9bec03f1bfd38bacb7e6c0d36c0eecd2fa8b2b | |
| parent | d5cc7acff1a4ea3e14d67faf99966c31a30d2a4d (diff) | |
| download | ffmpeg-53c1f5c2e28e54ea8174b196d5cf4a158907395a.tar.gz | |
avformat/mov: Check samplesize and offset to avoid integer overflow
Fixes: signed integer overflow: 9223372036854775584 + 536870912 cannot be represented in type 'long'
Fixes: 55844/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-510613920664780
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/mov.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/libavformat/mov.c b/libavformat/mov.c index 6ab43b00c6..8af564ed61 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -4192,6 +4192,13 @@ static void mov_build_index(MOVContext *mov, AVStream *st) if (keyframe) distance = 0; sample_size = sc->stsz_sample_size > 0 ? sc->stsz_sample_size : sc->sample_sizes[current_sample]; + if (current_offset > INT64_MAX - sample_size) { + av_log(mov->fc, AV_LOG_ERROR, "Current offset %"PRId64" or sample size %u is too large\n", + current_offset, + sample_size); + return; + } + if (sc->pseudo_stream_id == -1 || sc->stsc_data[stsc_index].id - 1 == sc->pseudo_stream_id) { AVIndexEntry *e; |