From: Steven Barth <steven@midlink.org>
Date: Tue, 22 Jan 2013 15:42:40 +0000 (+0100)
Subject: Don't segfault with an unset ula_prefix
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=7496f70e45964d9e4ac870582c8e4e3ce7c56ad6;p=oweals%2Fnetifd.git

Don't segfault with an unset ula_prefix
---

diff --git a/interface-ip.c b/interface-ip.c
index 892631d..ea4c3dd 100644
--- a/interface-ip.c
+++ b/interface-ip.c
@@ -634,12 +634,18 @@ void
 interface_ip_set_ula_prefix(const char *prefix)
 {
 	char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
-	strncpy(buf, prefix, sizeof(buf) - 1);
+	if (prefix)
+		strncpy(buf, prefix, sizeof(buf) - 1);
 	char *prefixaddr = strtok_r(buf, "/", &saveptr);
 
 	struct in6_addr addr;
-	if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1)
+	if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
+		if (ula_prefix) {
+			interface_update_prefix(NULL, NULL, &ula_prefix->node);
+			ula_prefix = NULL;
+		}
 		return;
+	}
 
 	int length;
 	char *prefixlen = strtok_r(NULL, ",", &saveptr);