Fix CVE-2018-1000097:

https://security-tracker.debian.org/tracker/CVE-2018-1000097
https://nvd.nist.gov/vuln/detail/CVE-2018-1000097

Patch taken from upstream bug report:
https://lists.gnu.org/archive/html/bug-gnu-utils/2018-02/msg00005.html

diff --git a/src/unshar.c b/src/unshar.c
index 80bc3a9..0fc3773 100644
--- a/src/unshar.c
+++ b/src/unshar.c
@@ -240,7 +240,7 @@ find_archive (char const * name, FILE * file, off_t start)
       off_t position = ftello (file);
 
       /* Read next line, fail if no more and no previous process.  */
-      if (!fgets (rw_buffer, BUFSIZ, file))
+      if (!fgets (rw_buffer, rw_base_size, file))
 	{
 	  if (!start)
 	    error (0, 0, _("Found no shell commands in %s"), name);
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<tr><td><span title='2022-09-29 22:59:48 +0200'>2022-09-29</span></td><td><a href='/guix/commit/tests/print.scm?id=8b2119a5e4793cad1df1070d488a54ceea420840'>import: print: Quasiquote properties</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/print.scm (package-&gt;code): Quasiquote properties.
* tests/print.scm (pkg-with-properties, pkg-with-properties-source):
New variables.
("package with properties"): New test

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>itd</td></tr>
<tr><td><span title='2021-11-17 23:43:14 +0100'>2021-11-17</span></td><td><a href='/guix/commit/tests/print.scm?id=3a317f7476f8c6012e166ff9f340f861938721c9'>Merge branch 'master' into core-updates-frozen</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-11-11 00:14:31 +0100'>2021-11-11</span></td><td><a href='/guix/commit/tests/print.scm?id=3756ce32674139376bcf11dac96bc562582088f7'>import: print: Replace packages and origins in 'arguments'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/print.scm (package-&gt;code)[variable-reference]
[object-&gt;code]: New procedures.
[package-lists-&gt;code]: Rewrite in terms of 'object-&gt;code'.
Pass the 'arguments' field through 'object-&gt;code'.
* tests/print.scm (pkg-with-arguments, pkg-with-arguments-source): New
variables.
("package with arguments"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-11-11 00:14:31 +0100'>2021-11-11</span></td><td><a href='/guix/commit/tests/print.scm?id=b2ed40c29f578d46d42cb1c5e99bd797cea3aba0'>import: print: Handle patches that are origins.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/print.scm (package-&gt;code)[source-&gt;code]: Handle patches
that are origins.
* tests/print.scm (pkg-with-origin-input): Add 'patches' field.
(pkg-with-origin-patch, pkg-with-origin-patch-source): New variables.
("package with origin patch"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-11-11 00:14:31 +0100'>2021-11-11</span></td><td><a href='/guix/commit/tests/print.scm?id=b3240ae846cb1ace2322a68eca3497f11d0be6f1'>import: print: Correctly handle URI lists.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/print.scm (package-&gt;code)[factorized-uri-code]: New
procedure.
[source-&gt;code]: Use it, and factorize URI when it's a list.
* tests/print.scm (pkg-with-origin-input): Check origin URI to a list.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-11-11 00:14:31 +0100'>2021-11-11</span></td><td><a href='/guix/commit/tests/print.scm?id=04d929570ad816793d7e0024a11314124ce87f98'>import: print: Properly render packages with origins as inputs.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/print.scm (package-&gt;code)[source-&gt;code]: Check whether
VERSION is true before calling 'factorize-uri'.
[package-lists-&gt;code]: Add clause for inputs that are origins.
* tests/print.scm (pkg-with-origin-input, pkg-with-origin-input-source):
New variables.
("package with origin input"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-07-11 00:49:16 +0200'>2021-07-11</span></td><td><a href='/guix/commit/tests/print.scm?id=ff992fcfaf8455910b4bb5e02861fe9ae3dfd974'>import: print: Emit new-style package inputs when possible.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/print.scm (redundant-input-labels?): New procedure.
(package-&gt;code)[package-lists-&gt;code]: Rename to...
[inputs-&gt;code]: ... this.  When 'redundant-input-labels?' returns true,
emit label-less inputs.  Adjust callers to new name.
* tests/print.scm (pkg-with-inputs): Adjust accordingly.
</span></span></td><td>Ludovic Courtès</td></tr>