Fix double free of InterfaceList (#1669298)

radvd-double_free_ifacelist.patch

@@ -0,0 +1,23 @@
+From fb1529d0573d3d9744a0e9fea8dd0becfc91ad85 Mon Sep 17 00:00:00 2001
+From: Pavel Zhukov <pzhukov@redhat.com>
+Date: Thu, 24 Jan 2019 13:21:55 +0100
+Subject: [PATCH] Fix double-free scenario in case if duplicate interface was
+ specified (Fixes #100).
+
+Signed-off-by: Pavel Zhukov <pzhukov@redhat.com>
+---
+ gram.y | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/gram.y b/gram.y
+index 5db3bde..20af2f3 100644
+--- a/gram.y
++++ b/gram.y
+@@ -958,6 +958,7 @@ struct Interface * readin_config(char const *path)
+ 		if (yyparse() != 0) {
+ 			free_ifaces(iface);
+ 			iface = 0;
++			IfaceList = 0;
+ 		} else {
+ 			dlog(LOG_DEBUG, 1, "config file, %s, syntax ok", path);
+ 		}

radvd.spec

@@ -1,7 +1,7 @@
 Summary: A Router Advertisement daemon
 Name: radvd
 Version: 2.17
-Release: 16%{?dist}
+Release: 17%{?dist}
 # The code includes the advertising clause, so it's GPL-incompatible
 License: BSD with advertising
 Group: System Environment/Daemons
@@ -14,6 +14,7 @@ Patch0: radvd-werror.patch
 Patch1: radvd-endianess.patch
 Patch2: radvd-stderr_logging.patch
 Patch3: radvd-nodaemon_manpage,patch
+Patch4: radvd-double_free_ifacelist.patch
 
 BuildRequires: gcc
 BuildRequires: bison
@@ -42,6 +43,7 @@ services.
 %patch1 -p1 -b .endianess
 %patch2 -p1 -b .stderr
 %patch3 -p1 -b .nodaemon
+%patch4 -p1 -b .ifacelist
 
 for F in CHANGES; do
     iconv -f iso-8859-1 -t utf-8 < "$F" > "${F}.new"
@@ -104,6 +106,9 @@ exit 0
 %{_sbindir}/radvdump
 
 %changelog
+* Sun Jan 27 2019 Pavel Zhukov <pzhukov@redhat.com> - 2.17-17
+- Fix double-free in InterfaceList
+
 * Tue Nov 27 2018 Pavel Zhukov <pzhukov@redhat.com> - 2.17-16
 - Depends on network-online target (#1652459)