diff --git a/include/netlink/attr.h b/include/netlink/attr.h
index 0ed3da3..82e4c38 100644
--- a/include/netlink/attr.h
+++ b/include/netlink/attr.h
@@ -205,7 +205,7 @@ extern int		nla_is_nested(struct nlattr *);
  * @arg value		NUL terminated character string.
  */
 #define NLA_PUT_STRING(msg, attrtype, value) \
-	NLA_PUT(msg, attrtype, strlen(value) + 1, value)
+	NLA_PUT(msg, attrtype, (int) strlen(value) + 1, value)
 
 /**
  * Add flag attribute to netlink message.
diff --git a/lib/attr.c b/lib/attr.c
index 66c029c..d3de399 100644
--- a/lib/attr.c
+++ b/lib/attr.c
@@ -648,7 +648,7 @@ int nla_put_u64(struct nl_msg *msg, int attrtype, uint64_t value)
  */
 uint64_t nla_get_u64(struct nlattr *nla)
 {
-	uint64_t tmp;
+	uint64_t tmp = 0;
 
 	nla_memcpy(&tmp, nla, sizeof(tmp));
 
diff --git a/lib/route/cls/u32.c b/lib/route/cls/u32.c
index e91c39a..0a4e83c 100644
--- a/lib/route/cls/u32.c
+++ b/lib/route/cls/u32.c
@@ -170,9 +170,12 @@ static int u32_clone(void *_dst, void *_src)
 	    !(dst->cu_selector = nl_data_clone(src->cu_selector)))
 		return -NLE_NOMEM;
 
-	if (src->cu_act && !(dst->cu_act = rtnl_act_alloc()))
-		return -NLE_NOMEM;
-	memcpy(dst->cu_act, src->cu_act, sizeof(struct rtnl_act));
+	if (src->cu_act) {
+		if (!(dst->cu_act = rtnl_act_alloc()))
+			return -NLE_NOMEM;
+
+		memcpy(dst->cu_act, src->cu_act, sizeof(struct rtnl_act));
+	}
 
 	if (src->cu_police && !(dst->cu_police = nl_data_clone(src->cu_police)))
 		return -NLE_NOMEM;