dhcp6: use unaligned_read_be32()

Closes #13591.

diff --git a/src/libsystemd-network/sd-dhcp6-client.c b/src/libsystemd-network/sd-dhcp6-client.c
index 5a3b0a6353bd851694ea7804f32dd4543528933f..9773a067d5858464ce67884861102b35c9f6b94c 100644 (file)
--- a/src/libsystemd-network/sd-dhcp6-client.c
+++ b/src/libsystemd-network/sd-dhcp6-client.c
@@ -1005,7 +1005,7 @@ static int client_parse_message(
                         if (optlen != 4)
                                 return -EINVAL;
 
-                        irt = be32toh(*(be32_t *) optval) * USEC_PER_SEC;
+                        irt = unaligned_read_be32((be32_t *) optval) * USEC_PER_SEC;
                         break;
                 }
 

diff --git a/test/fuzz/fuzz-dhcp6-client/crash-13591 b/test/fuzz/fuzz-dhcp6-client/crash-13591
new file mode 100644 (file)
index 0000000..20ac358
Binary files /dev/null and b/test/fuzz/fuzz-dhcp6-client/crash-13591 differ