Fix CVE-2018-1000877:

https://bugs.launchpad.net/ubuntu/+source/libarchive/+bug/1794909
https://github.com/libarchive/libarchive/pull/1105
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1000877
https://security-tracker.debian.org/tracker/CVE-2018-1000877

Patch copied from upstream source repository:

https://github.com/libarchive/libarchive/commit/021efa522ad729ff0f5806c4ce53e4a6cc1daa31

From 021efa522ad729ff0f5806c4ce53e4a6cc1daa31 Mon Sep 17 00:00:00 2001
From: Daniel Axtens <dja@axtens.net>
Date: Tue, 20 Nov 2018 17:56:29 +1100
Subject: [PATCH] Avoid a double-free when a window size of 0 is specified

new_size can be 0 with a malicious or corrupted RAR archive.

realloc(area, 0) is equivalent to free(area), so the region would
be free()d here and the free()d again in the cleanup function.

Found with a setup running AFL, afl-rb, and qsym.
---
 libarchive/archive_read_support_format_rar.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libarchive/archive_read_support_format_rar.c b/libarchive/archive_read_support_format_rar.c
index 23452222..6f419c27 100644
--- a/libarchive/archive_read_support_format_rar.c
+++ b/libarchive/archive_read_support_format_rar.c
@@ -2300,6 +2300,11 @@ parse_codes(struct archive_read *a)
       new_size = DICTIONARY_MAX_SIZE;
     else
       new_size = rar_fls((unsigned int)rar->unp_size) << 1;
+    if (new_size == 0) {
+      archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
+                        "Zero window size is invalid.");
+      return (ARCHIVE_FATAL);
+    }
     new_window = realloc(rar->lzss.window, new_size);
     if (new_window == NULL) {
       archive_set_error(&a->archive, ENOMEM,
-- 
2.20.1

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<div class='path'>path: <a href='/guix/log/?id=d3eebaf71dda8c1828aeb90596fa06d97eed67cc'>root</a>/<a href='/guix/log/gnu?id=d3eebaf71dda8c1828aeb90596fa06d97eed67cc'>gnu</a>/<a href='/guix/log/gnu/packages?id=d3eebaf71dda8c1828aeb90596fa06d97eed67cc'>packages</a>/<a href='/guix/log/gnu/packages/vpn.scm?id=d3eebaf71dda8c1828aeb90596fa06d97eed67cc'>vpn.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/vpn.scm?id=d3eebaf71dda8c1828aeb90596fa06d97eed67cc&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-06-06 21:09:32 -0400'>2023-06-06</span></td><td><a href='/guix/commit/gnu/packages/vpn.scm?id=8f90ab2dd4959fb1bb7f468365822839735fe182'>gnu: openconnect: Update to 9.12.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/vpn.scm (openconnect): Update to 9.12.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2023-06-06 21:09:31 -0400'>2023-06-06</span></td><td><a href='/guix/commit/gnu/packages/vpn.scm?id=b775c39b2c9fb820c4832e079a4c6334e738100b'>gnu: openconnect: Fix indentation, remove input labels and use gexps.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/vpn.scm (openconnect): Fix indentation.
[native-inputs, inputs, propagated-inputs]: Remove input labels.
[arguments]: Use gexps.
</span></span></td><td>Maxim Cournoyer</td></tr>