Fix CVE-2017-16844:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-16844
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=876511

Patch copied from Debian procmail package 3.22-26:

http://http.debian.net/debian/pool/main/p/procmail/procmail_3.22-26.debian.tar.xz

From: Santiago Vila <sanvila@debian.org>
Subject: Fix heap-based buffer overflow in loadbuf()
Bug-Debian: http://bugs.debian.org/876511
X-Debian-version: 3.22-26

--- a/src/formisc.c
+++ b/src/formisc.c
@@ -103,7 +103,7 @@
 }
 							    /* append to buf */
 void loadbuf(text,len)const char*const text;const size_t len;
-{ if(buffilled+len>buflen)			  /* buf can't hold the text */
+{ while(buffilled+len>buflen)			  /* buf can't hold the text */
      buf=realloc(buf,buflen+=Bsize);
   tmemmove(buf+buffilled,text,len);buffilled+=len;
 }
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<tr><td><span title='2022-02-26 15:56:55 +0100'>2022-02-26</span></td><td><a href='/guix/commit/gnu/installer/connman.scm?id=cc11905568065409fe46487174e1cf404291bda1'>installer: Continue even if Connman cannot phone home.</a><span class='msg-avail'>...<span class='msg-tooltip'>Connman's online check is unreliable for me.

* gnu/installer/connman.scm (connman-online?): Accept if
connman state is ready instead of online.
</span></span></td><td>Florian Pelz</td></tr>
<tr><td><span title='2020-09-21 00:31:15 +0200'>2020-09-21</span></td><td><a href='/guix/commit/gnu/installer/connman.scm?id=e1f3788944ee154ba9b33c891c4ccf039a1ff39a'>installer: Fix docstring typoes.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/installer/connman.scm (connman-state, run-locale-page)
(start-swapping, stop-swapping, run-installer-steps): Fix typo in
docstring.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-04-19 11:46:21 +0200'>2020-04-19</span></td><td><a href='/guix/commit/gnu/installer/connman.scm?id=ea6594e08e2724c64bc07724a07479fc1633dede'>installer: connman: Fix Wifi connection.</a><span class='msg-avail'>...<span class='msg-tooltip'>Issue reported by SergioBG here:
https://lists.gnu.org/archive/html/bug-guix/2020-04/msg00432.html.

Due to default buffering mode, the installer was reading from the pipe without
having actually written a command before.

* gnu/installer/connman.scm (connman-connect-with-auth): Set pipe buffering
mode to 'line.
</span></span></td><td>Mathieu Othacehe</td></tr>