php: Heap buffer overflow in function exif_process_IFD_TAG()

When processing certain files, PHP EXIF extension in versions 7.1.x below 7.1.28, 7.2.x below 7.2.17 and 7.3.x below 7.3.4 can be caused to read past allocated buffer in exifprocessIFDTAG function. This may lead to information disclosure or crash...