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| author | Michael Niedermayer <michael@niedermayer.cc> | 2022-02-13 15:20:02 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2022-04-06 20:27:35 +0200 |
| commit | 78eed60822f44205fae364855fec3dbd55b59432 (patch) | |
| tree | d885b20dc533d1723882c21d1b810e1e701a19f0 | |
| parent | cd310f05024de48d69c9ebf5581b42e9307b6c40 (diff) | |
| download | ffmpeg-78eed60822f44205fae364855fec3dbd55b59432.tar.gz | |
avformat/matroskadec: Check pre_ns
Fixes: division by 0
Fixes: 44615/clusterfuzz-testcase-minimized-ffmpeg_dem_WEBM_DASH_MANIFEST_fuzzer-6681108677263360
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 710e51677a6f3a5c2b37dc31a597957a22a5e531)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/matroskadec.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c index 78e592cba6..37884934a9 100644 --- a/libavformat/matroskadec.c +++ b/libavformat/matroskadec.c @@ -4128,6 +4128,8 @@ static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t // prebuffered. pre_bytes = desc_end.end_offset - desc_end.start_offset; pre_ns = desc_end.end_time_ns - desc_end.start_time_ns; + if (pre_ns <= 0) + return -1; pre_sec = pre_ns / nano_seconds_per_second; prebuffer_bytes += pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec); |