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

d=4e60d5dfb40ba604db114384469b8ebb2014efe3'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/easyrpg.scm'>
<input type='hidden' name='id' value='4e60d5dfb40ba604db114384469b8ebb2014efe3'/><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=4e60d5dfb40ba604db114384469b8ebb2014efe3'>root</a>/<a href='/guix/log/gnu?id=4e60d5dfb40ba604db114384469b8ebb2014efe3'>gnu</a>/<a href='/guix/log/gnu/packages?id=4e60d5dfb40ba604db114384469b8ebb2014efe3'>packages</a>/<a href='/guix/log/gnu/packages/easyrpg.scm?id=4e60d5dfb40ba604db114384469b8ebb2014efe3'>easyrpg.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/easyrpg.scm?id=4e60d5dfb40ba604db114384469b8ebb2014efe3&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-09-02 18:30:07 +0800'>2024-09-02</span></td><td><a href='/guix/commit/gnu/packages/easyrpg.scm?id=a3c6f1a38e517a0ec0badf6591ffafca00405b0b'>gnu: easyrpg-player: Enable MIDI format support.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/easyrpg.scm (easyrpg-player)[arguments]&lt;#:configure-flags&gt;:
Enable fmmidi option for MIDI format support.

Change-Id: I8253f84bdea7c9754e5b9e2bc1b413f2b63a5f19
Signed-off-by: 宋文武 &lt;iyzsong@member.fsf.org&gt;
</span></span></td><td>gemmaro</td></tr>
<tr><td><span title='2024-09-02 18:28:51 +0800'>2024-09-02</span></td><td><a href='/guix/commit/gnu/packages/easyrpg.scm?id=93896ac4d13b54ea45db4f465d194ff1f45318f5'>gnu: easyrpg-player: Update to 0.8.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/easyrpg.scm (easyrpg-player): Update to 0.8.

Change-Id: I05f3c6b66dfadc48a7569b3672096550c244e904
Signed-off-by: 宋文武 &lt;iyzsong@member.fsf.org&gt;
</span></span></td><td>gemmaro</td></tr>
<tr><td><span title='2024-09-02 18:28:34 +0800'>2024-09-02</span></td><td><a href='/guix/commit/gnu/packages/easyrpg.scm?id=5970cbefc257942a790c0adde33be3605946d203'>gnu: liblcf: Update to 0.8.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/easyrpg.scm (liblcf): Update to 0.8.

Change-Id: I97f458945b33b01bc76ab88c0c503d8a2bec275a
Signed-off-by: 宋文武 &lt;iyzsong@member.fsf.org&gt;
</span></span></td><td>gemmaro</td></tr>