Fix CVE-2017-5974:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5974

Patch copied from Debian.

Index: zziplib-0.13.62/zzip/memdisk.c
===================================================================
--- zziplib-0.13.62.orig/zzip/memdisk.c
+++ zziplib-0.13.62/zzip/memdisk.c
@@ -216,12 +216,12 @@ zzip_mem_entry_new(ZZIP_DISK * disk, ZZI
         /* override sizes/offsets with zip64 values for largefile support */
         zzip_extra_zip64 *block = (zzip_extra_zip64 *)
             zzip_mem_entry_extra_block(item, ZZIP_EXTRA_zip64);
-        if (block)
+        if (block && ZZIP_GET16(block->z_datasize) >= (8 + 8 + 8 + 4))
         {
-            item->zz_usize = __zzip_get64(block->z_usize);
-            item->zz_csize = __zzip_get64(block->z_csize);
-            item->zz_offset = __zzip_get64(block->z_offset);
-            item->zz_diskstart = __zzip_get32(block->z_diskstart);
+            item->zz_usize = ZZIP_GET64(block->z_usize);
+            item->zz_csize = ZZIP_GET64(block->z_csize);
+            item->zz_offset = ZZIP_GET64(block->z_offset);
+            item->zz_diskstart = ZZIP_GET32(block->z_diskstart);
         }
     }
     /* NOTE:
' href='/guix/log/po/packages/POTFILES.in'>log</a><a href='/guix/tree/po/packages/POTFILES.in?id=572641103880ce87b631e00e6212787747f694aa'>tree</a><a href='/guix/commit/po/packages/POTFILES.in?id=572641103880ce87b631e00e6212787747f694aa'>commit</a><a href='/guix/diff/po/packages/POTFILES.in?id=572641103880ce87b631e00e6212787747f694aa'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/po/packages/POTFILES.in'>
<input type='hidden' name='id' value='572641103880ce87b631e00e6212787747f694aa'/><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=572641103880ce87b631e00e6212787747f694aa'>root</a>/<a href='/guix/log/po?id=572641103880ce87b631e00e6212787747f694aa'>po</a>/<a href='/guix/log/po/packages?id=572641103880ce87b631e00e6212787747f694aa'>packages</a>/<a href='/guix/log/po/packages/POTFILES.in?id=572641103880ce87b631e00e6212787747f694aa'>POTFILES.in</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/po/packages/POTFILES.in?id=572641103880ce87b631e00e6212787747f694aa&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-02-12 15:11:36 +0800'>2021-02-12</span></td><td><a href='/guix/commit/po/packages/POTFILES.in?id=db6b9d2f4bc59511904e8c1412d0257675c46095'>services: Add transmission-daemon service.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/file-sharing.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* po/packages/POTFILES.in: Add it.
* tests/services/file-sharing.scm: New file.
* Makefile.am (SCM_TESTS): Add it.
* doc/guix.texi (File-Sharing Services): New section.

Signed-off-by: 宋文武 &lt;iyzsong@member.fsf.org&gt;
</span></span></td><td>Simon South</td></tr>