ibmvnic: Print data buffers with kernel API's

Previously, data buffers that were to be printed were cast to 8 byte
integers and printed. This can lead to buffer overflow if the length
of the buffer is not a multiple of 8.

Simplify and safeguard printing by using kernel provided functions
to print these data blobs.

Reviewed-by: Jacob Keller <[email protected]>
Signed-off-by: Nick Child <[email protected]>
Signed-off-by: NipaLocal <nipa@local>

Author: Nick Child

drivers/net/ethernet/ibm/ibmvnic.c

@@ -4836,6 +4836,7 @@ static int send_login(struct ibmvnic_adapter *adapter)
 	struct device *dev = &adapter->vdev->dev;
 	struct vnic_login_client_data *vlcd;
 	dma_addr_t rsp_buffer_token;
+	unsigned char hex_str[16 * 3];
 	dma_addr_t buffer_token;
 	size_t rsp_buffer_size;
 	union ibmvnic_crq crq;
@@ -4939,9 +4940,9 @@ static int send_login(struct ibmvnic_adapter *adapter)
 	vnic_add_client_data(adapter, vlcd);
 
 	netdev_dbg(adapter->netdev, "Login Buffer:\n");
-	for (i = 0; i < (adapter->login_buf_sz - 1) / 8 + 1; i++) {
-		netdev_dbg(adapter->netdev, "%016lx\n",
-			   ((unsigned long *)(adapter->login_buf))[i]);
+	for_each_line_in_hex_dump(i, 16, hex_str, sizeof(hex_str), 8,
+				  adapter->login_buf, adapter->login_buf_sz) {
+		netdev_dbg(adapter->netdev, "%s\n", hex_str);
 	}
 
 	memset(&crq, 0, sizeof(crq));
@@ -5319,15 +5320,17 @@ static void handle_query_ip_offload_rsp(struct ibmvnic_adapter *adapter)
 {
 	struct device *dev = &adapter->vdev->dev;
 	struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf;
+	unsigned char hex_str[16 * 3];
 	int i;
 
 	dma_unmap_single(dev, adapter->ip_offload_tok,
 			 sizeof(adapter->ip_offload_buf), DMA_FROM_DEVICE);
 
 	netdev_dbg(adapter->netdev, "Query IP Offload Buffer:\n");
-	for (i = 0; i < (sizeof(adapter->ip_offload_buf) - 1) / 8 + 1; i++)
-		netdev_dbg(adapter->netdev, "%016lx\n",
-			   ((unsigned long *)(buf))[i]);
+	for_each_line_in_hex_dump(i, 16, hex_str, sizeof(hex_str), 8, buf,
+				  sizeof(adapter->ip_offload_buf)) {
+		netdev_dbg(adapter->netdev, "%s\n", hex_str);
+	}
 
 	netdev_dbg(adapter->netdev, "ipv4_chksum = %d\n", buf->ipv4_chksum);
 	netdev_dbg(adapter->netdev, "ipv6_chksum = %d\n", buf->ipv6_chksum);
@@ -5520,6 +5523,7 @@ static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq,
 	struct net_device *netdev = adapter->netdev;
 	struct ibmvnic_login_rsp_buffer *login_rsp = adapter->login_rsp_buf;
 	struct ibmvnic_login_buffer *login = adapter->login_buf;
+	unsigned char hex_str[16 * 3];
 	u64 *tx_handle_array;
 	u64 *rx_handle_array;
 	int num_tx_pools;
@@ -5558,9 +5562,10 @@ static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq,
 	netdev->mtu = adapter->req_mtu - ETH_HLEN;
 
 	netdev_dbg(adapter->netdev, "Login Response Buffer:\n");
-	for (i = 0; i < (adapter->login_rsp_buf_sz - 1) / 8 + 1; i++) {
-		netdev_dbg(adapter->netdev, "%016lx\n",
-			   ((unsigned long *)(adapter->login_rsp_buf))[i]);
+	for_each_line_in_hex_dump(i, 16, hex_str, sizeof(hex_str), 8,
+				  adapter->login_rsp_buf,
+				  adapter->login_rsp_buf_sz) {
+		netdev_dbg(adapter->netdev, "%s\n", hex_str);
 	}
 
 	/* Sanity checks */