NULL Pointer Access in function imagetopnm of convert.c:2226(jp2) in OpenJPEG 2.1.2. Impact is Denial of Service. Someone must open a crafted j2k file.Referenceshttps://security.gentoo.org/glsa/201710-26https://github.com/uclouvain/openjpeg/issues/859http://www.securityfocus.com/bid/93975
