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Date:   Wed, 29 May 2019 10:15:28 -0500
From:   "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To:     Mike Marciniszyn <mike.marciniszyn@intel.com>,
        Dennis Dalessandro <dennis.dalessandro@intel.com>,
        Doug Ledford <dledford@redhat.com>,
        Jason Gunthorpe <jgg@ziepe.ca>
Cc:     linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org,
        "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Subject: [PATCH][next] IB/hfi1: Use struct_size() helper
Message-ID: <20190529151528.GA24148@embeddedor>
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User-Agent: Mutt/1.9.4 (2018-02-28)
Sender: linux-kernel-owner@vger.kernel.org
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Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes, in particular in the
context in which this code is being used.

So, replace the following form:

sizeof(struct opa_port_status_rsp) + num_vls * sizeof(struct _vls_pctrs)

with:

struct_size(rsp, vls, num_vls)

and so on...

Also, notice that variable size is unnecessary, hence it is removed.

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
 drivers/infiniband/hw/hfi1/mad.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/mad.c b/drivers/infiniband/hw/hfi1/mad.c
index 4228393e6c4c..184dba3c2828 100644
--- a/drivers/infiniband/hw/hfi1/mad.c
+++ b/drivers/infiniband/hw/hfi1/mad.c
@@ -2744,8 +2744,7 @@ static int pma_get_opa_portstatus(struct opa_pma_mad *pmp,
 	u16 link_width;
 	u16 link_speed;
 
-	response_data_size = sizeof(struct opa_port_status_rsp) +
-				num_vls * sizeof(struct _vls_pctrs);
+	response_data_size = struct_size(rsp, vls, num_vls);
 	if (response_data_size > sizeof(pmp->data)) {
 		pmp->mad_hdr.status |= OPA_PM_STATUS_REQUEST_TOO_LARGE;
 		return reply((struct ib_mad_hdr *)pmp);
@@ -3014,8 +3013,7 @@ static int pma_get_opa_datacounters(struct opa_pma_mad *pmp,
 	}
 
 	/* Sanity check */
-	response_data_size = sizeof(struct opa_port_data_counters_msg) +
-				num_vls * sizeof(struct _vls_dctrs);
+	response_data_size = struct_size(req, port[0].vls, num_vls);
 
 	if (response_data_size > sizeof(pmp->data)) {
 		pmp->mad_hdr.status |= IB_SMP_INVALID_FIELD;
@@ -3232,8 +3230,7 @@ static int pma_get_opa_porterrors(struct opa_pma_mad *pmp,
 		return reply((struct ib_mad_hdr *)pmp);
 	}
 
-	response_data_size = sizeof(struct opa_port_error_counters64_msg) +
-				num_vls * sizeof(struct _vls_ectrs);
+	response_data_size = struct_size(req, port[0].vls, num_vls);
 
 	if (response_data_size > sizeof(pmp->data)) {
 		pmp->mad_hdr.status |= IB_SMP_INVALID_FIELD;
-- 
2.21.0