linux-kernel - RE: [PATCH] cxl/pmem: Use size_add() against integer overflow

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Message-ID: <635326141b6d9_4da3294cd@dwillia2-xfh.jf.intel.com.notmuch>
Date:   Fri, 21 Oct 2022 16:07:00 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Yu Zhe <yuzhe@...china.com>, <alison.schofield@...el.com>,
        <vishal.l.verma@...el.com>, <ira.weiny@...el.com>,
        <bwidawsk@...nel.org>, <dan.j.williams@...el.com>
CC:     <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <liqiong@...china.com>, <kernel-janitors@...r.kernel.org>,
        Yu Zhe <yuzhe@...china.com>
Subject: RE: [PATCH] cxl/pmem: Use size_add() against integer overflow

Yu Zhe wrote:
> "struct_size() + n" may cause a integer overflow,
> use size_add() to handle it.
> 
> Signed-off-by: Yu Zhe <yuzhe@...china.com>
> ---
>  drivers/cxl/pmem.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/cxl/pmem.c b/drivers/cxl/pmem.c
> index 7dc0a2fa1a6b..8c08aa009a56 100644
> --- a/drivers/cxl/pmem.c
> +++ b/drivers/cxl/pmem.c
> @@ -148,7 +148,7 @@ static int cxl_pmem_set_config_data(struct cxl_dev_state *cxlds,
>  		return -EINVAL;
>  
>  	/* 4-byte status follows the input data in the payload */
> -	if (struct_size(cmd, in_buf, cmd->in_length) + 4 > buf_len)
> +	if (size_add(struct_size(cmd, in_buf, cmd->in_length), 4) > buf_len)
>  		return -EINVAL;

Looks good, applied for v6.1-rc fixes.