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oavformat/avidec: Check offset in odml

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Fixes: signed integer overflow: 9223372036854775807 + 8 cannot be represented in type 'long'
Fixes: 38787/clusterfuzz-testcase-minimized-ffmpeg_dem_AVI_fuzzer-4859845799444480

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-09-19 21:51:28 +02:00
parent 83b2e4c8f1
commit 255a7b423e
1 changed files with 1 additions and 1 deletions
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libavformat/avidec.c
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@ -244,7 +244,7 @@ static int read_odml_index(AVFormatContext *s, int64_t frame_num)
avio_rl32(pb); /* size */
duration = avio_rl32(pb);
if (avio_feof(pb))
if (avio_feof(pb) || offset > INT64_MAX - 8)
return AVERROR_INVALIDDATA;
pos = avio_tell(pb);