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| author | Michael Niedermayer <michael@niedermayer.cc> | 2022-01-17 14:26:05 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2022-04-09 22:19:40 +0200 |
| commit | 423a3b685f318d989842959d30088f49bd2124ff (patch) | |
| tree | 1ea4e4c0ab91ef0cd48909640671bebe8234397c | |
| parent | 210b4b9871c21f1e9cdcaa8daeb9d4c64564a0dd (diff) | |
| download | ffmpeg-423a3b685f318d989842959d30088f49bd2124ff.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 dfbd94dfc6..b266687656 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -6897,6 +6897,8 @@ 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; |