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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 d8d9d506a3)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-01-17 14:26:05 +01:00
parent 210b4b9871
commit 423a3b685f
1 changed files with 2 additions and 0 deletions
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2
libavformat/mov.c
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@ -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;