Avoid a SEGV due to a corrupted pnm file. CVE assignment: http://seclists.org/oss-sec/2016/q2/459 Upstream patches related to PNM file handling: https://anonscm.debian.org/cgit/collab-maint/imagemagick.git/commit/?h=debian-patches/6.8.9.9-4-for-upstream&id=fcf54f0b0f1a277f2e480ac37d731c6a0e5eb473 https://anonscm.debian.org/cgit/collab-maint/imagemagick.git/commit/?h=debian-patches/6.8.9.9-4-for-upstream&id=7f7b0f8e5eb8f4180e31ed93c65f0e1dd20050cb https://anonscm.debian.org/cgit/collab-maint/imagemagick.git/commit/?h=debian-patches/6.8.9.9-4-for-upstream&id=7a7119c6fe19324ee17b8f756dae60c16e470ab2 https://anonscm.debian.org/cgit/collab-maint/imagemagick.git/commit/?h=debian-patches/6.8.9.9-4-for-upstream&id=0a89a1ccca6e7ee059b73f5cc924513383e8a330 https://anonscm.debian.org/cgit/collab-maint/imagemagick.git/commit/?h=debian-patches/6.8.9.9-4-for-upstream&id=030c376fe4c97aea2178996e658b4c33aa9a736a