libtiff: assertion failure on downsampled OJPEG file

The OJPEGPostDecode function in tifojpeg.c in LibTIFF 3.9.0 and 3.9.2, as used in tiff2ps, allows remote attackers to cause a denial of service assertion failure and application exit via a crafted TIFF image, related to "downsampled OJPEG input."...