php: Heap buffer over-read in exif_scan_thumbnail()

When PHP EXIF extension is parsing EXIF information from an image, e.g. via exifreaddata function, in PHP versions 7.1.x below 7.1.31, 7.2.x below 7.2.21 and 7.3.x below 7.3.8 it is possible to supply it with data what will cause it to read past the allocated buffer. This may lead to information...

php:php-fuzz-exif: Use-of-uninitialized-value in exif_process_TIFF_in_JPEG

Detailed Report: https://oss-fuzz.com/testcase?key=5631203063627776 Project: php Fuzzing Engine: libFuzzer Fuzz Target: php-fuzz-exif Job Type: libfuzzermsanphp Platform Id: linux Crash Type: Use-of-uninitialized-value Crash Address: Crash State: exifprocessTIFFinJPEG exifscanJPEGheader...