diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 3e6f300ba9f175d35ae906e5ba80e447d4696940..606d59aece2b6aa18c796785b543b581ed11fa32 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2234,11 +2234,11 @@ static ssize_t rbd_add(struct bus_type *bus,
 	if (!try_module_get(THIS_MODULE))
 		return -ENODEV;
 
-	mon_dev_name = kmalloc(RBD_MAX_OPT_LEN, GFP_KERNEL);
+	mon_dev_name = kmalloc(count, GFP_KERNEL);
 	if (!mon_dev_name)
 		goto err_out_mod;
 
-	options = kmalloc(RBD_MAX_OPT_LEN, GFP_KERNEL);
+	options = kmalloc(count, GFP_KERNEL);
 	if (!options)
 		goto err_mon_dev;