RDMA/ucma: Use struct_size() helper

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index 140a338..cbe4600 100644 (file)
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -951,8 +951,7 @@ static ssize_t ucma_query_path(struct ucma_context *ctx,
                }
        }
 
-       if (copy_to_user(response, resp,
-                        sizeof(*resp) + (i * sizeof(struct ib_path_rec_data))))
+       if (copy_to_user(response, resp, struct_size(resp, path_data, i)))
                ret = -EFAULT;
 
        kfree(resp);