netdev - [PATCH 04/26] gve: use array

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Date: Fri, 23 Jun 2023 23:14:35 +0200
From: Julia Lawall <Julia.Lawall@...ia.fr>
To: Jeroen de Borst <jeroendb@...gle.com>
Cc: keescook@...omium.org,
	kernel-janitors@...r.kernel.org,
	Praveen Kaligineedi <pkaligineedi@...gle.com>,
	Shailend Chand <shailend@...gle.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 04/26] gve: use array_size

Use array_size to protect against multiplication overflows.

The changes were done using the following Coccinelle semantic patch:

// <smpl>
@@
    size_t e1,e2;
    expression COUNT;
    identifier alloc = {vmalloc,vzalloc,kvmalloc,kvzalloc};
@@

(
      alloc(
-           (e1) * (e2)
+           array_size(e1, e2)
      ,...)
|
      alloc(
-           (e1) * (COUNT)
+           array_size(COUNT, e1)
      ,...)
)
// </smpl>

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

---
 drivers/net/ethernet/google/gve/gve_tx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/google/gve/gve_tx.c b/drivers/net/ethernet/google/gve/gve_tx.c
index 813da572abca..d77ebbb24936 100644
--- a/drivers/net/ethernet/google/gve/gve_tx.c
+++ b/drivers/net/ethernet/google/gve/gve_tx.c
@@ -248,7 +248,7 @@ static int gve_tx_alloc_ring(struct gve_priv *priv, int idx)
 	tx->mask = slots - 1;
 
 	/* alloc metadata */
-	tx->info = vzalloc(sizeof(*tx->info) * slots);
+	tx->info = vzalloc(array_size(slots, sizeof(*tx->info)));
 	if (!tx->info)
 		return -ENOMEM;