Fix CVE-2017-8779:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8779

Patch copied from the bug reporter's 3rd-party repository:

https://github.com/guidovranken/rpcbomb/blob/master/rpcbind_patch.txt

diff --git a/src/rpcb_svc_com.c b/src/rpcb_svc_com.c
index 5862c26..e11f61b 100644
--- a/src/rpcb_svc_com.c
+++ b/src/rpcb_svc_com.c
@@ -48,6 +48,7 @@
 #include <rpc/rpc.h>
 #include <rpc/rpcb_prot.h>
 #include <rpc/svc_dg.h>
+#include <rpc/rpc_com.h>
 #include <netconfig.h>
 #include <errno.h>
 #include <syslog.h>
@@ -432,7 +433,7 @@ rpcbproc_taddr2uaddr_com(void *arg, struct svc_req *rqstp /*__unused*/,
 static bool_t
 xdr_encap_parms(XDR *xdrs, struct encap_parms *epp)
 {
-	return (xdr_bytes(xdrs, &(epp->args), (u_int *) &(epp->arglen), ~0));
+	return (xdr_bytes(xdrs, &(epp->args), (u_int *) &(epp->arglen), RPC_MAXDATASIZE));
 }
 
 /*
elect> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=8b6b097714962beeb675cad6425b2417dc564dab'>refs</a><a class='active' href='/guix/log/gnu/packages/hyperledger.scm'>log</a><a href='/guix/tree/gnu/packages/hyperledger.scm?id=8b6b097714962beeb675cad6425b2417dc564dab'>tree</a><a href='/guix/commit/gnu/packages/hyperledger.scm?id=8b6b097714962beeb675cad6425b2417dc564dab'>commit</a><a href='/guix/diff/gnu/packages/hyperledger.scm?id=8b6b097714962beeb675cad6425b2417dc564dab'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/hyperledger.scm'>
<input type='hidden' name='id' value='8b6b097714962beeb675cad6425b2417dc564dab'/><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=8b6b097714962beeb675cad6425b2417dc564dab'>root</a>/<a href='/guix/log/gnu?id=8b6b097714962beeb675cad6425b2417dc564dab'>gnu</a>/<a href='/guix/log/gnu/packages?id=8b6b097714962beeb675cad6425b2417dc564dab'>packages</a>/<a href='/guix/log/gnu/packages/hyperledger.scm?id=8b6b097714962beeb675cad6425b2417dc564dab'>hyperledger.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/hyperledger.scm?id=8b6b097714962beeb675cad6425b2417dc564dab&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-11-06 00:08:04 -0400'>2022-11-06</span></td><td><a href='/guix/commit/gnu/packages/hyperledger.scm?id=451d2802f6471d1a5f2eea08ae7ce2ad8747f797'>gnu: fmt: Update to 9.1.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/pretty-print.scm (fmt): Update to 9.1.0.
(fmt-8): New variable.
* gnu/packages/hyperledger.scm (hyperledger-iroha)
[snippet]: Delete trailing  #t.
[native-inputs]: Re-indent.  Replace fmt with fmt-8.
* gnu/packages/networking.scm (opendht) [inputs]: Replace fmt with fmt-8.
* gnu/packages/storage.scm (ceph): Likewise.
* gnu/packages/video.scm (mkvtoolnix): Likewise.
* gnu/packages/aidc.scm (zxing-cpp): Likewise.
* gnu/packages/wm.scm (waybar): Likewise.
* gnu/packages/geo.scm (osm2pgsql): Likewise.
* gnu/packages/graphics.scm (openimageio): Likewise.
* gnu/packages/build-tools.scm (bear): Likewise.
* gnu/packages/networking.scm (restinio): Likewise.
</span></span></td><td>Maxim Cournoyer</td></tr>