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| author | Michael Niedermayer <michael@niedermayer.cc> | 2021-04-20 17:40:56 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-09-08 21:31:50 +0200 |
| commit | 890a801468c1ec615ea4dfc667053f9ac571ea95 (patch) | |
| tree | e5c832e33e8e812a6fcbd94a529c099a62d84bc9 | |
| parent | ebc5ea216f3ab12551eecb2ceee15bb868298208 (diff) | |
| download | ffmpeg-890a801468c1ec615ea4dfc667053f9ac571ea95.tar.gz | |
avformat/mov: Avoid undefined overflow in time_offset calculation
Fixes: signed integer overflow: 8511838621821575200 - -3954125146725285889 cannot be represented in type 'long'
Fixes: 33414/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-6610119325515776
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 7666d588ba1af26ce479e7fb92f7dc5b3a2ca48e)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/mov.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/libavformat/mov.c b/libavformat/mov.c index 0f5a961c2e..56c538cf63 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -3837,7 +3837,11 @@ static void mov_build_index(MOVContext *mov, AVStream *st) if ((empty_duration || start_time) && mov->time_scale > 0) { if (empty_duration) empty_duration = av_rescale(empty_duration, sc->time_scale, mov->time_scale); - sc->time_offset = start_time - empty_duration; + + if (av_sat_sub64(start_time, empty_duration) != start_time - (uint64_t)empty_duration) + av_log(mov->fc, AV_LOG_WARNING, "start_time - empty_duration is not representable\n"); + + sc->time_offset = start_time - (uint64_t)empty_duration; sc->min_corrected_pts = start_time; if (!mov->advanced_editlist) current_dts = -sc->time_offset; |