diff --git a/driver/quectel_MHI/src/core/mhi_init.c b/driver/quectel_MHI/src/core/mhi_init.c
index bd8c2675..1436838a 100644
--- a/driver/quectel_MHI/src/core/mhi_init.c
+++ b/driver/quectel_MHI/src/core/mhi_init.c
@@ -93,7 +93,8 @@ struct mhi_bus mhi_bus;
 
 const char *to_mhi_pm_state_str(enum MHI_PM_STATE state)
 {
-	int index = find_last_bit((unsigned long *)&state, 32);
+	unsigned long value = state;
+	int index = find_last_bit(&value, 32);
 
 	if (index >= ARRAY_SIZE(mhi_pm_state_str))
 		return "Invalid State";
diff --git a/driver/quectel_MHI/src/devices/mhi_netdev_quectel.c b/driver/quectel_MHI/src/devices/mhi_netdev_quectel.c
index 8ecd2c99..a9108626 100644
--- a/driver/quectel_MHI/src/devices/mhi_netdev_quectel.c
+++ b/driver/quectel_MHI/src/devices/mhi_netdev_quectel.c
@@ -1137,10 +1137,24 @@ static netdev_tx_t rmnet_vnd_start_xmit(struct sk_buff *skb,
 	}
 	else {
 		if (priv->qmap_version == 5) {
-			add_qhdr(skb, priv->mux_id);
+			struct sk_buff *new_skb = add_qhdr(skb, priv->mux_id);
+			if (!new_skb) {
+				// print error
+				printk(KERN_ERR"add_qhdr failed, drop skb\n");
+				dev_kfree_skb_any(skb);
+				return NETDEV_TX_OK;
+			}
+			skb = new_skb;
 		}
 		else if (priv->qmap_version == 9) {
-			add_qhdr_v5(skb, priv->mux_id);
+			struct sk_buff *new_skb = add_qhdr_v5(skb, priv->mux_id);
+			if (!new_skb) {
+				// print error
+				printk(KERN_ERR"add_qhdr_v5 failed, drop skb\n");
+				dev_kfree_skb_any(skb);
+				return NETDEV_TX_OK;
+			}
+			skb = new_skb;
 		}
 		else {
 			dev_kfree_skb_any (skb);
@@ -2419,10 +2433,24 @@ static netdev_tx_t mhi_netdev_xmit(struct sk_buff *skb, struct net_device *dev)
 	}
 	else if (mhi_netdev->net_type == MHI_NET_RMNET) {
 		if (mhi_netdev->qmap_version == 5) {
-			add_qhdr(skb, QUECTEL_QMAP_MUX_ID);
+			struct sk_buff *new_skb = add_qhdr(skb, QUECTEL_QMAP_MUX_ID);
+			if (!new_skb) {
+				// print error
+				printk("add_qhdr failed, drop skb, mode MHI_NET_RMNET\n");
+				dev_kfree_skb_any(skb);
+				return NETDEV_TX_OK;
+			}
+			skb = new_skb;
 		}
 		else if (mhi_netdev->qmap_version == 9) {
-			add_qhdr_v5(skb, QUECTEL_QMAP_MUX_ID);
+			struct sk_buff *new_skb = add_qhdr_v5(skb, QUECTEL_QMAP_MUX_ID);
+			if (!new_skb) {
+				// print error
+				printk("add_qhdr_v5 failed, drop skb, mode MHI_NET_RMNET\n");
+				dev_kfree_skb_any(skb);
+				return NETDEV_TX_OK;
+			}
+			skb = new_skb;
 		}
 		else {
 			dev_kfree_skb_any (skb);