From: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Date: Wed, 17 Jun 2020 13:53:17 -0500
Subject: enetc: Use struct_size() helper in kzalloc()

Git-commit: 1260e772dd184b29266b552d90cbf80f6ee4b066
Patch-mainline: v5.9-rc1
References: jsc#SLE-12251

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 and, audited and
fixed manually.

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
 drivers/net/ethernet/freescale/enetc/enetc.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index 298c55786fd9..61dbf19075fb 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -1687,7 +1687,7 @@ int enetc_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
 int enetc_alloc_msix(struct enetc_ndev_priv *priv)
 {
 	struct pci_dev *pdev = priv->si->pdev;
-	int size, v_tx_rings;
+	int v_tx_rings;
 	int i, n, err, nvec;
 
 	nvec = ENETC_BDR_INT_BASE_IDX + priv->bdr_int_num;
@@ -1702,15 +1702,13 @@ int enetc_alloc_msix(struct enetc_ndev_priv *priv)
 
 	/* # of tx rings per int vector */
 	v_tx_rings = priv->num_tx_rings / priv->bdr_int_num;
-	size = sizeof(struct enetc_int_vector) +
-	       sizeof(struct enetc_bdr) * v_tx_rings;
 
 	for (i = 0; i < priv->bdr_int_num; i++) {
 		struct enetc_int_vector *v;
 		struct enetc_bdr *bdr;
 		int j;
 
-		v = kzalloc(size, GFP_KERNEL);
+		v = kzalloc(struct_size(v, tx_ring, v_tx_rings), GFP_KERNEL);
 		if (!v) {
 			err = -ENOMEM;
 			goto fail;
-- 
2.26.2