Package: libungif-bin Severity: normal Tags: patch GIFs don't have to have a global colour map, it can be absent and supplied in a per-image colour map. This causes utils/giftext to segfault. Christian Holler aka decoder_at_own-hero_dot_net discovered this problem in GIFs comprising part of image-only spam. giftext is used in his spamassassin plugin to decode and catch this type of spam.
I'm forwarding his patch so that it can be included in Debian and Debian users can have the benefit of it. Thanks and acknowledgements are due to him. Nick Leverton -- System Information: Debian Release: testing/unstable APT prefers testing APT policy: (800, 'testing'), (60, 'stable'), (3, 'unstable') Architecture: i386 (i686) Shell: /bin/sh linked to /bin/bash Kernel: Linux 2.6.16-16bpo1.20060720.0-k7-njl Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
*** giftext.c.orig 2006-08-21 15:41:47.000000000 -0400 --- giftext.c 2006-08-21 15:41:55.000000000 -0400 *************** *** 135,141 **** GifFileName, GifFile->SWidth, GifFile->SHeight); printf("\tColorResolution = %d, BitsPerPixel = %d, BackGround = %d.\n", GifFile->SColorResolution, ! GifFile->SColorMap->BitsPerPixel, GifFile->SBackGroundColor); if (GifFile->SColorMap) printf("\tHas Global Color Map.\n\n"); --- 135,141 ---- GifFileName, GifFile->SWidth, GifFile->SHeight); printf("\tColorResolution = %d, BitsPerPixel = %d, BackGround = %d.\n", GifFile->SColorResolution, ! GifFile->SColorMap?GifFile->SColorMap->BitsPerPixel:0, GifFile->SBackGroundColor); if (GifFile->SColorMap) printf("\tHas Global Color Map.\n\n");