linux-kernel - [PATCH v2 18/24] net: enetc: use vmalloc

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Message-Id: <20230627144339.144478-19-Julia.Lawall@inria.fr>
Date:   Tue, 27 Jun 2023 16:43:33 +0200
From:   Julia Lawall <Julia.Lawall@...ia.fr>
To:     Claudiu Manoil <claudiu.manoil@....com>
Cc:     kernel-janitors@...r.kernel.org, keescook@...omium.org,
        christophe.jaillet@...adoo.fr, kuba@...nel.org,
        Vladimir Oltean <vladimir.oltean@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 18/24] net: enetc: use vmalloc_array and vcalloc

Use vmalloc_array and vcalloc to protect against
multiplication overflows.

The changes were done using the following Coccinelle
semantic patch:

// <smpl>
@initialize:ocaml@
@@

let rename alloc =
  match alloc with
    "vmalloc" -> "vmalloc_array"
  | "vzalloc" -> "vcalloc"
  | _ -> failwith "unknown"

@@
    size_t e1,e2;
    constant C1, C2;
    expression E1, E2, COUNT, x1, x2, x3;
    typedef u8;
    typedef __u8;
    type t = {u8,__u8,char,unsigned char};
    identifier alloc = {vmalloc,vzalloc};
    fresh identifier realloc = script:ocaml(alloc) { rename alloc };
@@

(
      alloc(x1*x2*x3)
|
      alloc(C1 * C2)
|
      alloc((sizeof(t)) * (COUNT), ...)
|
-     alloc((e1) * (e2))
+     realloc(e1, e2)
|
-     alloc((e1) * (COUNT))
+     realloc(COUNT, e1)
|
-     alloc((E1) * (E2))
+     realloc(E1, E2)
)
// </smpl>

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

---
v2: Use vmalloc_array and vcalloc instead of array_size.
This also leaves a multiplication of a constant by a sizeof
as is.  Two patches are thus dropped from the series.

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

diff -u -p a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -1789,7 +1789,7 @@ static int enetc_alloc_tx_resource(struc
 	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 = vcalloc(bd_count, sizeof(*res->tx_swbd));
 	if (!res->tx_swbd)
 		return -ENOMEM;
 
@@ -1877,7 +1877,7 @@ static int enetc_alloc_rx_resource(struc
 	if (extended)
 		res->bd_size *= 2;
 
-	res->rx_swbd = vzalloc(bd_count * sizeof(struct enetc_rx_swbd));
+	res->rx_swbd = vcalloc(bd_count, sizeof(struct enetc_rx_swbd));
 	if (!res->rx_swbd)
 		return -ENOMEM;