linux-kernel - [PATCH 02/26] octeon_ep: use array

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Message-Id: <20230623211457.102544-3-Julia.Lawall@inria.fr>
Date:   Fri, 23 Jun 2023 23:14:33 +0200
From:   Julia Lawall <Julia.Lawall@...ia.fr>
To:     Veerasenareddy Burru <vburru@...vell.com>
Cc:     keescook@...omium.org, kernel-janitors@...r.kernel.org,
        Abhijit Ayarekar <aayarekar@...vell.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 02/26] octeon_ep: 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/marvell/octeon_ep/octep_rx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_rx.c b/drivers/net/ethernet/marvell/octeon_ep/octep_rx.c
index 392d9b0da0d7..185b7e50ee77 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_rx.c
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_rx.c
@@ -158,7 +158,7 @@ static int octep_setup_oq(struct octep_device *oct, int q_no)
 		goto desc_dma_alloc_err;
 	}
 
-	oq->buff_info = vzalloc(oq->max_count * OCTEP_OQ_RECVBUF_SIZE);
+	oq->buff_info = vzalloc(array_size(oq->max_count, OCTEP_OQ_RECVBUF_SIZE));
 	if (unlikely(!oq->buff_info)) {
 		dev_err(&oct->pdev->dev,
 			"Failed to allocate buffer info for OQ-%d\n", q_no);