linux-kernel - Re: [PATCH v2 10/24] bus: mhi: host: use vmalloc

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Message-ID: <dd87f23b-d559-f544-c9bc-69ee592c17e8@quicinc.com>
Date:   Tue, 27 Jun 2023 08:48:30 -0600
From:   Jeffrey Hugo <quic_jhugo@...cinc.com>
To:     Julia Lawall <Julia.Lawall@...ia.fr>,
        Manivannan Sadhasivam <mani@...nel.org>
CC:     <kernel-janitors@...r.kernel.org>, <keescook@...omium.org>,
        <christophe.jaillet@...adoo.fr>, <kuba@...nel.org>,
        <mhi@...ts.linux.dev>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 10/24] bus: mhi: host: use vmalloc_array and vcalloc

On 6/27/2023 8:43 AM, Julia Lawall wrote:
> 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>
> 

Reviewed-by: Jeffrey Hugo <quic_jhugo@...cinc.com>