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

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<div class='path'>path: <a href='/guix/log/?id=aeec4a8fc1dce690b5d6aeb163871aca93d50111&amp;showmsg=1'>root</a>/<a href='/guix/log/gnu?id=aeec4a8fc1dce690b5d6aeb163871aca93d50111&amp;showmsg=1'>gnu</a>/<a href='/guix/log/gnu/packages?id=aeec4a8fc1dce690b5d6aeb163871aca93d50111&amp;showmsg=1'>packages</a>/<a href='/guix/log/gnu/packages/dico.scm?id=aeec4a8fc1dce690b5d6aeb163871aca93d50111&amp;showmsg=1'>dico.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/packages/dico.scm?id=aeec4a8fc1dce690b5d6aeb163871aca93d50111'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2018-09-27 03:51:06 +0200'>2018-09-27</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/dico.scm?id=3d190d6a219d03dc94c8d33614766df0fed1473f'>gnu: dico: Update to 2.7.</a></td><td>Tobias Geerinckx-Rice</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/dico.scm (dico): Update to 2.7.
[arguments]: Work around dodgy test in 'check' phase.


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<tr class='logheader'><td><span title='2018-08-28 12:35:02 +0200'>2018-08-28</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/dico.scm?id=1ae29e3f5a1f13b4ddfedd066b2e55556db031ce'>gnu: dico: Update to 2.6.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/dico.scm (dico): Update to 2.6.
[inputs]: Switch to GUILE-2.2.


</td></tr>
<tr class='logheader'><td><span title='2018-01-29 20:46:55 +0200'>2018-01-29</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/dico.scm?id=a6a9e628693ed2d49cd9cdfca597fd4e63bbdef0'>gnu: dico: Update to 2.5.</a></td><td>Efraim Flashner</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/dico.scm (dico): Update to 2.5.
[inputs]: Add wordnet.


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