diff --git a/SOURCES/radvd-crash_if_config_removed.patch b/SOURCES/radvd-crash_if_config_removed.patch
new file mode 100644
index 0000000..1c75ccc
--- /dev/null
+++ b/SOURCES/radvd-crash_if_config_removed.patch
@@ -0,0 +1,65 @@
+From 57295ef0e85640adcc3b85f08b12f09d54aad2d2 Mon Sep 17 00:00:00 2001
+From: Tomi Salminen <tsalminen@forcepoint.com>
+Date: Tue, 16 Apr 2019 13:55:39 +0300
+Subject: [PATCH] Crash on SIGHUP when config file removed.
+
+Reading config zeroed the returnable configuration only when the
+config file was opened successfully. If not, the previously read
+in configuration was returned, which was already freed.
+
+Moved configuration zeroing to start of readin_config and added
+unit test to test zero return.
+---
+ gram.y      |  2 +-
+ test/util.c | 15 +++++++++++++++
+ 2 files changed, 16 insertions(+), 1 deletion(-)
+
+diff --git a/gram.y b/gram.y
+index 20af2f3..4115390 100644
+--- a/gram.y
++++ b/gram.y
+@@ -947,10 +947,10 @@ static void cleanup(void)
+ 
+ struct Interface * readin_config(char const *path)
+ {
++	IfaceList = 0;
+ 	FILE * in = fopen(path, "r");
+ 	if (in) {
+ 		filename = path;
+-		IfaceList = 0;
+ 		num_lines = 1;
+ 		iface = 0;
+ 
+diff --git a/test/util.c b/test/util.c
+index b74b301..7124475 100644
+--- a/test/util.c
++++ b/test/util.c
+@@ -259,6 +259,20 @@ START_TEST(test_rand_between)
+ }
+ END_TEST
+ 
++START_TEST(test_cfg_removal_with_sighup)
++{
++  struct Interface *tmpIface = NULL;
++
++  tmpIface = readin_config("test/test1.conf");
++  ck_assert(tmpIface);
++
++  free_ifaces(tmpIface);
++
++  tmpIface = readin_config("test/file_that_should_not_exists.conf");
++  ck_assert(!tmpIface);
++}
++END_TEST
++
+ Suite *util_suite(void)
+ {
+ 	TCase *tc_safe_buffer = tcase_create("safe_buffer");
+@@ -288,6 +302,7 @@ Suite *util_suite(void)
+ 
+ 	TCase *tc_misc = tcase_create("misc");
+ 	tcase_add_test(tc_misc, test_rand_between);
++	tcase_add_test(tc_misc, test_cfg_removal_with_sighup);
+ 
+ 	Suite *s = suite_create("util");
+ 	suite_add_tcase(s, tc_safe_buffer);
diff --git a/SOURCES/radvd-double_free_dupiface.patch b/SOURCES/radvd-double_free_dupiface.patch
new file mode 100644
index 0000000..16c59b8
--- /dev/null
+++ b/SOURCES/radvd-double_free_dupiface.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);
+ 		}
diff --git a/SPECS/radvd.spec b/SPECS/radvd.spec
index e553c4c..198a43d 100644
--- a/SPECS/radvd.spec
+++ b/SPECS/radvd.spec
@@ -1,7 +1,7 @@
 Summary: A Router Advertisement daemon
 Name: radvd
 Version: 2.17
-Release: 14%{?dist}
+Release: 15%{?dist}
 # The code includes the advertising clause, so it's GPL-incompatible
 License: BSD with advertising
 Group: System Environment/Daemons
@@ -21,6 +21,8 @@ Requires(pre): shadow-utils
 
 Patch0: radvd_add_ra_memleak.patch
 Patch1: radvd_tmpfiles.patch
+Patch2: radvd-double_free_dupiface.patch
+Patch3: radvd-crash_if_config_removed.patch
 
 %description
 radvd is the router advertisement daemon for IPv6.  It listens to router
@@ -97,6 +99,9 @@ exit 0
 %{_sbindir}/radvdump
 
 %changelog
+* Wed Apr 15 2020 Pavel Zhukov <pzhukov@redhat.com> - 2.17-15
+- Fix double-free scenario (#1669177)
+
 * Fri Oct 25 2019 Pavel Zhukov <pzhukov@redhat.com> - 2.17-14
 - Resolves: #1710787 - Change location of tmpfiles
 - Use tmpfile config from tarball