netdev - [PATCH 18/26] net: enetc: use array

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Message-Id: <20230623211457.102544-19-Julia.Lawall@inria.fr>
Date: Fri, 23 Jun 2023 23:14:49 +0200
From: Julia Lawall <Julia.Lawall@...ia.fr>
To: Claudiu Manoil <claudiu.manoil@....com>
Cc: keescook@...omium.org,
	kernel-janitors@...r.kernel.org,
	Vladimir Oltean <vladimir.oltean@....com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 18/26] net: enetc: use array_size

Use array_size to protect against multiplication overflows.

The changes were done using the following Coccinelle semantic patch:

// <smpl>
@@
    expression E1, E2;
    constant C1, C2;
    identifier alloc = {vmalloc,vzalloc};
@@
    
(
      alloc(C1 * C2,...)
|
      alloc(
-           (E1) * (E2)
+           array_size(E1, E2)
      ,...)
)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...ia.fr>

---
 drivers/net/ethernet/freescale/enetc/enetc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index 9e1b2536e9a9..7231f8ea1ba4 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -1790,7 +1790,7 @@ static int enetc_alloc_tx_resource(struct enetc_bdr_resource *res,
 	res->bd_count = bd_count;
 	res->bd_size = sizeof(union enetc_tx_bd);
 
-	res->tx_swbd = vzalloc(bd_count * sizeof(*res->tx_swbd));
+	res->tx_swbd = vzalloc(array_size(bd_count, sizeof(*res->tx_swbd)));
 	if (!res->tx_swbd)
 		return -ENOMEM;
 
@@ -1878,7 +1878,7 @@ static int enetc_alloc_rx_resource(struct enetc_bdr_resource *res,
 	if (extended)
 		res->bd_size *= 2;
 
-	res->rx_swbd = vzalloc(bd_count * sizeof(struct enetc_rx_swbd));
+	res->rx_swbd = vzalloc(array_size(bd_count, sizeof(struct enetc_rx_swbd)));
 	if (!res->rx_swbd)
 		return -ENOMEM;