GHSA-462X-PGG6-55FP Pillow tiled-TIFF decoder reads past tile buffer in copy4 (Unpack.c:1290)

Summary Pillow's libImaging decodeTile decoder, used to decode tiled TIFF images, allocates a per-tile buffer using reallocstate-buffer, TIFFTileSizetiff. After each TIFFReadTile it then iterates tiley from 0 up to currenttilelength and calls the configured row unpacker here copy4 with the source...