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

ux-libre/6.11-i686.conf?id=e00c621cbbf58a54ca2dd0c7075f154af26bcd54'>commit</a><a href='/guix/diff/gnu/packages/aux-files/linux-libre/6.11-i686.conf?id=e00c621cbbf58a54ca2dd0c7075f154af26bcd54'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/aux-files/linux-libre/6.11-i686.conf'>
<input type='hidden' name='id' value='e00c621cbbf58a54ca2dd0c7075f154af26bcd54'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=e00c621cbbf58a54ca2dd0c7075f154af26bcd54'>root</a>/<a href='/guix/log/gnu?id=e00c621cbbf58a54ca2dd0c7075f154af26bcd54'>gnu</a>/<a href='/guix/log/gnu/packages?id=e00c621cbbf58a54ca2dd0c7075f154af26bcd54'>packages</a>/<a href='/guix/log/gnu/packages/aux-files?id=e00c621cbbf58a54ca2dd0c7075f154af26bcd54'>aux-files</a>/<a href='/guix/log/gnu/packages/aux-files/linux-libre?id=e00c621cbbf58a54ca2dd0c7075f154af26bcd54'>linux-libre</a>/<a href='/guix/log/gnu/packages/aux-files/linux-libre/6.11-i686.conf?id=e00c621cbbf58a54ca2dd0c7075f154af26bcd54'>6.11-i686.conf</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/aux-files/linux-libre/6.11-i686.conf?id=e00c621cbbf58a54ca2dd0c7075f154af26bcd54&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-10-20 16:16:51 -0400'>2024-10-20</span></td><td><a href='/guix/commit/gnu/packages/aux-files/linux-libre/6.11-i686.conf?id=92910f5413fd9112c0502138eed5fff758c5de65'>gnu: Add linux-libre 6.11.4.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/linux.scm (linux-libre-6.11-version, linux-libre-6.11-gnu-revision,
deblob-scripts-6.11, linux-libre-6.11-pristine-source, linux-libre-6.11-source,
linux-libre-headers-6.11, linux-libre-6.11): New variables.
* gnu/packages/aux-files/linux-libre/6.11-arm.conf,
gnu/packages/aux-files/linux-libre/6.11-arm64.conf,
gnu/packages/aux-files/linux-libre/6.11-i686.conf,
gnu/packages/aux-files/linux-libre/6.11-riscv.conf,
gnu/packages/aux-files/linux-libre/6.11-x86.conf: New files.
* Makefile.am (AUX_FILES): Add them.

Co-authored-by: Ahmad Draidi &lt;a.r.draidi@redscript.org&gt;

Change-Id: I35bad9fbea9f568e60e7f24c95f85c240ef96277
Signed-off-by: Leo Famulari &lt;leo@famulari.name&gt;
</span></span></td><td>Wilko Meyer</td></tr>