4 files changed, 21 insertions, 4 deletions
diff --git a/examples/nfct-mnl-create.c b/examples/nfct-mnl-create.c
index 64387a7..7fd224d 100644
--- a/examples/nfct-mnl-create.c
+++ b/examples/nfct-mnl-create.c
@@ -60,7 +60,11 @@ int main(void)
 	nfct_set_attr_u8(ct, ATTR_TCP_STATE, TCP_CONNTRACK_SYN_SENT);
 	nfct_set_attr_u32(ct, ATTR_TIMEOUT, 100);
 
-	nfct_nlmsg_build(nlh, ct);
+	ret = nfct_nlmsg_build(nlh, ct);
+	if (ret == -1) {
+		perror("nfct_nlmsg_build");
+		exit(EXIT_FAILURE);
+	}
 
 	ret = mnl_socket_sendto(nl, nlh, nlh->nlmsg_len);
 	if (ret == -1) {
diff --git a/examples/nfct-mnl-del.c b/examples/nfct-mnl-del.c
index 91ad9e4..806d9f8 100644
--- a/examples/nfct-mnl-del.c
+++ b/examples/nfct-mnl-del.c
@@ -55,7 +55,11 @@ int main(void)
 	nfct_set_attr_u16(ct, ATTR_PORT_SRC, htons(20));
 	nfct_set_attr_u16(ct, ATTR_PORT_DST, htons(10));
 
-	nfct_nlmsg_build(nlh, ct);
+	ret = nfct_nlmsg_build(nlh, ct);
+	if (ret == -1) {
+		perror("nfct_nlmsg_build");
+		exit(EXIT_FAILURE);
+	}
 
 	ret = mnl_socket_sendto(nl, nlh, nlh->nlmsg_len);
 	if (ret == -1) {
diff --git a/examples/nfct-mnl-get.c b/examples/nfct-mnl-get.c
index 4858acf..5be3331 100644
--- a/examples/nfct-mnl-get.c
+++ b/examples/nfct-mnl-get.c
@@ -74,7 +74,11 @@ int main(void)
 	nfct_set_attr_u16(ct, ATTR_PORT_SRC, htons(20));
 	nfct_set_attr_u16(ct, ATTR_PORT_DST, htons(10));
 
-	nfct_nlmsg_build(nlh, ct);
+	ret = nfct_nlmsg_build(nlh, ct);
+	if (ret == -1) {
+		perror("nfct_nlmsg_build");
+		exit(EXIT_FAILURE);
+	}
 
 	ret = mnl_socket_sendto(nl, nlh, nlh->nlmsg_len);
 	if (ret == -1) {
diff --git a/examples/nfct-mnl-set-label.c b/examples/nfct-mnl-set-label.c
index c52b267..50bebb0 100644
--- a/examples/nfct-mnl-set-label.c
+++ b/examples/nfct-mnl-set-label.c
@@ -19,6 +19,7 @@ static void set_label(struct nf_conntrack *ct, struct callback_args *cbargs)
 	char buf[MNL_SOCKET_BUFFER_SIZE];
 	struct nlmsghdr *nlh;
 	struct nfgenmsg *nfh;
+	int ret;
 
 	if (b) {
 		if (bit < 0)
@@ -55,7 +56,11 @@ static void set_label(struct nf_conntrack *ct, struct callback_args *cbargs)
 	nfh->version = NFNETLINK_V0;
 	nfh->res_id = 0;
 
-	nfct_nlmsg_build(nlh, ct);
+	ret = nfct_nlmsg_build(nlh, ct);
+	if (ret == -1) {
+		perror("nfct_nlmsg_build");
+		exit(EXIT_FAILURE);
+	}
 
 	if (mnl_socket_sendto(cbargs->nl, nlh, nlh->nlmsg_len) < 0)
 		perror("mnl_socket_sendto");