1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/infiniband/core/multicast.c b/drivers/infiniband/core/multicast.c
index 4eb72ff539fc..6c48f4193dda 100644
--- a/drivers/infiniband/core/multicast.c
+++ b/drivers/infiniband/core/multicast.c
@@ -813,7 +813,7 @@ static void mcast_add_one(struct ib_device *device)
         int i;
         int count = 0;
 
-        dev = kmalloc(sizeof *dev + device->phys_port_cnt * sizeof *port,
+        dev = kmalloc(struct_size(dev, port, device->phys_port_cnt),
                       GFP_KERNEL);
         if (!dev)
                 return;