network-address,test-network: avoid undefined behaviour

[elogind.git] / src / network / networkd-address.c

diff --git a/src/network/networkd-address.c b/src/network/networkd-address.c
index ce0e923cbe035092f362ec4d8a42396c8f921aa6..47033acde4e1fab18fcb32e764d13a53707fcf12 100644 (file)
--- a/src/network/networkd-address.c
+++ b/src/network/networkd-address.c
@@ -592,6 +592,10 @@ bool address_equal(Address *a1, Address *a2) {
         case AF_INET:
                 if (a1->prefixlen != a2->prefixlen)
                         return false;
+                else if (a1->prefixlen == 0)
+                        /* make sure we don't try to shift by 32.
+                         * See ISO/IEC 9899:TC3 § 6.5.7.3. */
+                        return true;
                 else {
                         uint32_t b1, b2;