From: Evgeny Vereshchagin <evvers@ya.ru>
Date: Sat, 29 Jan 2022 02:08:39 +0000 (+0000)
Subject: sd-dhcp-lease: fix an infinite loop found by the fuzzer
X-Git-Tag: v251-rc1~420^2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=86b06c666be8b7afb45541d35aa4d0ecb38056d1;p=thirdparty%2Fsystemd.git

sd-dhcp-lease: fix an infinite loop found by the fuzzer
---

diff --git a/src/libsystemd-network/sd-dhcp-lease.c b/src/libsystemd-network/sd-dhcp-lease.c
index ab131701fbc..bc6591a39b1 100644
--- a/src/libsystemd-network/sd-dhcp-lease.c
+++ b/src/libsystemd-network/sd-dhcp-lease.c
@@ -492,10 +492,8 @@ static int lease_parse_routes(
 
                 route->option = SD_DHCP_OPTION_STATIC_ROUTE;
                 r = in4_addr_default_prefixlen((struct in_addr*) option, &route->dst_prefixlen);
-                if (r < 0) {
-                        log_debug("Failed to determine destination prefix length from class based IP, ignoring");
-                        continue;
-                }
+                if (r < 0)
+                        return -EINVAL;
 
                 assert_se(lease_parse_be32(option, 4, &addr.s_addr) >= 0);
                 route->dst_addr = inet_makeaddr(inet_netof(addr), 0);