util: specify the maximum-size element when initialize union

Fixes oss-fuzz#11344.

diff --git a/src/basic/in-addr-util.h b/src/basic/in-addr-util.h
index 2dafa3c0842b03b57f6269b8517ed4aefeaf311f..2f64c31f96b1ccb7c92452c70ecbbf21759d03e0 100644 (file)
--- a/src/basic/in-addr-util.h
+++ b/src/basic/in-addr-util.h
@@ -65,7 +65,9 @@ static inline size_t FAMILY_ADDRESS_SIZE(int family) {
         return family == AF_INET6 ? 16 : 4;
 }
 
-#define IN_ADDR_NULL ((union in_addr_union) {})
+/* Workaround for clang, explicitly specify the maximum-size element here.
+ * See also oss-fuzz#11344. */
+#define IN_ADDR_NULL ((union in_addr_union) { .in6 = {} })
 
 void in_addr_data_hash_func(const void *p, struct siphash *state);
 int in_addr_data_compare_func(const void *a, const void *b);