[SCSI] zfcp: Use memdup_user and kstrdup

Use the functions memdup_user and kstrdup to allocate memory and copy
the data in one step, saving some lines of code.
Reviewed-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

drivers/s390/scsi/zfcp_aux.c

@@ -98,13 +98,11 @@ static void __init zfcp_init_device_setup(char *devstr)
 	u64 wwpn, lun;
 
 	/* duplicate devstr and keep the original for sysfs presentation*/
-	str_saved = kmalloc(strlen(devstr) + 1, GFP_KERNEL);
+	str_saved = kstrdup(devstr, GFP_KERNEL);
 	str = str_saved;
 	if (!str)
 		return;
 
-	strcpy(str, devstr);
-
 	token = strsep(&str, ",");
 	if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE)
 		goto err_out;

drivers/s390/scsi/zfcp_cfdc.c

@@ -189,18 +189,12 @@ static long zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
 	if (!fsf_cfdc)
 		return -ENOMEM;
 
-	data = kmalloc(sizeof(struct zfcp_cfdc_data), GFP_KERNEL);
-	if (!data) {
-		retval = -ENOMEM;
+	data = memdup_user(data_user, sizeof(*data_user));
+	if (IS_ERR(data)) {
+		retval = PTR_ERR(data);
 		goto no_mem_sense;
 	}
 
-	retval = copy_from_user(data, data_user, sizeof(*data));
-	if (retval) {
-		retval = -EFAULT;
-		goto free_buffer;
-	}
-
 	if (data->signature != 0xCFDCACDF) {
 		retval = -EINVAL;
 		goto free_buffer;