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To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r286349 - stable/9/sbin/routed
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Author: delphij
Date: Wed Aug  5 22:05:07 2015
New Revision: 286349
URL: https://svnweb.freebsd.org/changeset/base/286349

Log:
  Fix routed remote denial of service vulnerability. [SA-15:19]

Modified:
  stable/9/sbin/routed/input.c

Modified: stable/9/sbin/routed/input.c
==============================================================================
--- stable/9/sbin/routed/input.c	Wed Aug  5 22:05:02 2015	(r286348)
+++ stable/9/sbin/routed/input.c	Wed Aug  5 22:05:07 2015	(r286349)
@@ -160,6 +160,12 @@ input(struct sockaddr_in *from,		/* rece
 
 	trace_rip("Recv", "from", from, sifp, rip, cc);
 
+	if (sifp == 0) {
+		trace_pkt("    discard a request from an indirect router"
+		    " (possibly an attack)");
+		return;
+	}
+
 	if (rip->rip_vers == 0) {
 		msglim(&bad_router, FROM_NADDR,
 		       "RIP version 0, cmd %d, packet received from %s",