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| author | Michael Niedermayer <michael@niedermayer.cc> | 2022-01-17 14:26:05 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2022-02-16 18:55:58 +0100 |
| commit | ea9125a43f1dec0e40841f51d92ef404260330e5 (patch) | |
| tree | 6da53c0a472db8bed06cad0318cb793aaca48619 | |
| parent | 9a1fa28965b04cd875cc9d54f537c5617fb0e414 (diff) | |
| download | ffmpeg-ea9125a43f1dec0e40841f51d92ef404260330e5.tar.gz | |
avformat/mov: Check size before subtraction
Fixes: signed integer overflow: -9223372036854775808 - 8 cannot be represented in type 'long'
Fixes: 43542/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-5237670148702208
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 d8d9d506a3de976b647bcbb8f76c7b8d30eff576)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/mov.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/libavformat/mov.c b/libavformat/mov.c index affc0a0f04..94b2c079e3 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -4093,6 +4093,8 @@ static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom) if (a.size == 0) { a.size = atom.size - total_size + 8; } + if (a.size < 0) + break; a.size -= 8; if (a.size < 0) break; |