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

(cherry picked from commit 86b06c666be8b7afb45541d35aa4d0ecb38056d1)
(cherry picked from commit 426807c54b9500b806eaaf50d32c7c936510706c)

diff --git a/src/libsystemd-network/sd-dhcp-lease.c b/src/libsystemd-network/sd-dhcp-lease.c
index 9a0d7f6feaccab5b00c059954a98bced0d1e8163..75aa0c3d2c5944fec1e9e8daca34988b4373518c 100644 (file)
--- a/src/libsystemd-network/sd-dhcp-lease.c
+++ b/src/libsystemd-network/sd-dhcp-lease.c
@@ -463,10 +463,8 @@ 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);