linux-kernel - Re: [PATCH v4 45/47] net/wan/fsl_ucc_hdlc: reject muram offsets above 64K

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Message-ID: <CAOZdJXUibQ6RM8O4CfkYBdGsg+LMcE2ZoZEQ4txn2yvquUWwCA@mail.gmail.com>
Date:   Thu, 14 Nov 2019 22:41:55 -0600
From:   Timur Tabi <timur@...nel.org>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Qiang Zhao <qiang.zhao@....com>, Li Yang <leoyang.li@....com>,
        Christophe Leroy <christophe.leroy@....fr>,
        linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Scott Wood <oss@...error.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v4 45/47] net/wan/fsl_ucc_hdlc: reject muram offsets above 64K

On Fri, Nov 8, 2019 at 7:04 AM Rasmus Villemoes
<linux@...musvillemoes.dk> wrote:

> diff --git a/drivers/net/wan/fsl_ucc_hdlc.c b/drivers/net/wan/fsl_ucc_hdlc.c
> index 8d13586bb774..f029eaa7cfc0 100644
> --- a/drivers/net/wan/fsl_ucc_hdlc.c
> +++ b/drivers/net/wan/fsl_ucc_hdlc.c
> @@ -245,6 +245,11 @@ static int uhdlc_init(struct ucc_hdlc_private *priv)
>                 ret = -ENOMEM;
>                 goto free_riptr;
>         }
> +       if (riptr != (u16)riptr || tiptr != (u16)tiptr) {

"riptr/tiptr > U16_MAX" is clearer.