libexif / libexif / 15778849174

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exif_data_save_data_entry: avoid overflow

https://issuetracker.google.com/issues/423139834

this avoids an integer overflow when writing out data.

This needs an attacker able to cause libexif to write out data, which is usually done in programs.

This is not triggerable by parsing EXIF data.

2 of 3 new or added lines in 1 file covered. (66.67%)

3396 of 4200 relevant lines covered (80.86%)

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