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avformat/mxfdec: More offset_temp checks

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Fixes: signed integer overflow: 9223372036854775807 - -1927491430256034080 cannot be represented in type 'long'
Fixes: 70607/clusterfuzz-testcase-minimized-ffmpeg_dem_MXF_fuzzer-5282235077951488

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Tomas Härdin <git@haerdin.se>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-09-12 22:29:04 +02:00
parent 176db9db6e
commit 5a96aa435a
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1 changed files with 5 additions and 0 deletions
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libavformat/mxfdec.c
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@ -1921,6 +1921,11 @@ static int mxf_edit_unit_absolute_offset(MXFContext *mxf, MXFIndexTable *index_t
return mxf_absolute_bodysid_offset(mxf, index_table->body_sid, offset_temp, offset_out, partition_out);
} else {
/* EditUnitByteCount == 0 for VBR indexes, which is fine since they use explicit StreamOffsets */
if (s->edit_unit_byte_count && (s->index_duration > INT64_MAX / s->edit_unit_byte_count ||
s->edit_unit_byte_count * s->index_duration > INT64_MAX - offset_temp)
)
return AVERROR_INVALIDDATA;
offset_temp += s->edit_unit_byte_count * s->index_duration;
}
}