linux-kernel - Re: [PATCH] cxl/acpi: Use printk specifier for resource

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Date:   Mon, 17 Jul 2023 09:28:47 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     Breno Leitao <leitao@...ian.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        "Ira Weiny" <ira.weiny@...el.com>,
        Dan Williams <dan.j.williams@...el.com>
CC:     <leit@...a.com>, kernel test robot <lkp@...el.com>,
        "open list:COMPUTE EXPRESS LINK (CXL)" <linux-cxl@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cxl/acpi: Use printk specifier for resource



On 7/17/23 03:26, Breno Leitao wrote:
> Commit 3840e10e8dca ("cxl/acpi: Fix a use-after-free in cxl_parse_cfmws()")
> is using %llx to print resources pointers, but it is incorrect on 32-bits
> system, causing the following compilation warning on i386:
> 
> 	 drivers/cxl/acpi.c:300:4: warning: format specifies type 'unsigned long long' but the argument has type 'resource_size_t' (aka 'unsigned int') [-Wformat]
> 
> Instead of using pointers to the resource, uses the proper printk
> specifier that knows how to handle the struct "resources".
> 
> This is the new format, being printed now:
> 
> 	Failed to add decode range: [mem 0x4080000000-0x2baffffffff flags 0x200]
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202307151059.2vvBt55H-lkp@intel.com/
> Fixes: 3840e10e8dca ("cxl/acpi: Fix a use-after-free in cxl_parse_cfmws()")
> Suggested-by: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: Breno Leitao <leitao@...ian.org>

Reviewed-by: Dave Jiang <dave.jiang@...el.com>
> ---
>   drivers/cxl/acpi.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c
> index 815b43859c16..d1c559879dcc 100644
> --- a/drivers/cxl/acpi.c
> +++ b/drivers/cxl/acpi.c
> @@ -296,8 +296,7 @@ static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg,
>   	else
>   		rc = cxl_decoder_autoremove(dev, cxld);
>   	if (rc) {
> -		dev_err(dev, "Failed to add decode range [%#llx - %#llx]\n",
> -			res->start, res->end);
> +		dev_err(dev, "Failed to add decode range: %pr", res);
>   		return rc;
>   	}
>   	dev_dbg(dev, "add: %s node: %d range [%#llx - %#llx]\n",