Patch for gzip integer overflow (CVE-2010-0001)
Rediffed from upstream patch (commits 844994b00b and e9368c1189)

diff -Naru a/Makefile.am b/Makefile.am
--- a/Makefile.am	2009-10-30 19:38:55.000000000 +0100
+++ b/Makefile.am	2010-01-14 08:12:32.846290866 +0100
@@ -102,6 +102,7 @@
 	@echo 'Test succeeded.'
 
 TESTS =						\
+  tests/helin-segv				\
   tests/trailing-nul				\
   tests/zdiff					\
   tests/zgrep-f
diff -Naru a/tests/helin-segv b/tests/helin-segv
--- a/tests/helin-segv	1970-01-01 01:00:00.000000000 +0100
+++ b/tests/helin-segv	2010-01-14 08:13:25.230298339 +0100
@@ -0,0 +1,37 @@
+#!/bin/sh
+# Before gzip-1.4, gzip -d would segfault on some inputs.
+
+# Copyright (C) 2010 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+# limit so don't run it by default.
+
+if test "$VERBOSE" = yes; then
+ set -x
+ gzip --version
+fi
+
+: ${srcdir=.}
+. "$srcdir/tests/init.sh"; path_prepend_ .
+
+# This test case was provided by Aki Helin.
+printf '\037\235\220\0\0\0\304' > helin.gz || framework_failure
+printf '\0\0' > exp || framework_failure
+
+fail=0
+
+gzip -dc helin.gz > out || fail=1
+compare out exp || fail=1
+
+Exit $fail
diff -Naru a/unlzw.c b/unlzw.c
--- a/unlzw.c	2009-09-26 20:20:40.000000000 +0200
+++ b/unlzw.c	2010-01-14 08:16:49.390292054 +0100
@@ -244,7 +244,8 @@
 	int  o;
 
     resetbuf:
-	e = insize-(o = (posbits>>3));
+	o = posbits >> 3;
+	e = o <= insize ? insize - o : 0;
 
 	for (i = 0 ; i < e ; ++i) {
 	    inbuf[i] = inbuf[i+o];