Extracted from a patch in Fedora.

http://pkgs.fedoraproject.org/cgit/unzip.git/tree/unzip-6.0-heap-overflow-infloop.patch?id=d18f821e

From bd150334fb4084f5555a6be26b015a0671cb5b74 Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Tue, 22 Sep 2015 18:52:23 +0200
Subject: [PATCH 3/3] extract: prevent unsigned overflow on invalid input

Suggested-by: Stefan Cornelius
---
 extract.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/extract.c b/extract.c
index 29db027..b9ae667 100644
--- a/extract.c
+++ b/extract.c
@@ -1257,8 +1257,17 @@ static int extract_or_test_entrylist(__G__ numchunk,
         if (G.lrec.compression_method == STORED) {
             zusz_t csiz_decrypted = G.lrec.csize;
 
-            if (G.pInfo->encrypted)
+            if (G.pInfo->encrypted) {
+                if (csiz_decrypted <= 12) {
+                    /* handle the error now to prevent unsigned overflow */
+                    Info(slide, 0x401, ((char *)slide,
+                      LoadFarStringSmall(ErrUnzipNoFile),
+                      LoadFarString(InvalidComprData),
+                      LoadFarStringSmall2(Inflate)));
+                    return PK_ERR;
+                }
                 csiz_decrypted -= 12;
+            }
             if (G.lrec.ucsize != csiz_decrypted) {
                 Info(slide, 0x401, ((char *)slide,
                   LoadFarStringSmall2(WrnStorUCSizCSizDiff),
-- 
2.5.2

28b9fa22120c2b8305b9324442b94d'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/services/rsync.scm'>
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<div class='path'>path: <a href='/guix/log/?id=23a59b180b28b9fa22120c2b8305b9324442b94d'>root</a>/<a href='/guix/log/gnu?id=23a59b180b28b9fa22120c2b8305b9324442b94d'>gnu</a>/<a href='/guix/log/gnu/services?id=23a59b180b28b9fa22120c2b8305b9324442b94d'>services</a>/<a href='/guix/log/gnu/services/rsync.scm?id=23a59b180b28b9fa22120c2b8305b9324442b94d'>rsync.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/rsync.scm?id=23a59b180b28b9fa22120c2b8305b9324442b94d&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-03-04 15:22:58 +0100'>2019-03-04</span></td><td><a href='/guix/commit/gnu/services/rsync.scm?id=56a93cb975ddc33d50183fb122e2aafda026f18e'>services: Use 'file-append' for user account shells.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/cuirass.scm (cuirass-account): Use 'file-append' instead
of #~(string-append #$shadow "/sbin/nologin").
* gnu/services/monitoring.scm (zabbix-server-account): Likewise.
(zabbix-agent-account): Likewise.
* gnu/services/rsync.scm (rsync-account): Likewise.
* gnu/services/ssh.scm (%openssh-accounts): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-09-23 21:07:27 +0100'>2017-09-23</span></td><td><a href='/guix/commit/gnu/services/rsync.scm?id=9db7e9be59820190a97de22ba72e71fa25f9d168'>gnu: Add rsync service.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/guix.texi (Networking Services): Add rsync service documentation.
* gnu/services/rsync.scm (&lt;rsync-configuration&gt;): New file.
* gnu/tests/rsync.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add new files.

Signed-off-by: Christopher Baines &lt;mail@cbaines.net&gt;
</span></span></td><td>Oleg Pykhalov</td></tr>