linux-kernel - Re: [v3] misc: pci_endpoint_test: Fix return resource_size_t from pci_resource

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Message-ID: <20241230175249.lx32nb2adsm54qh3@thinkpad>
Date: Mon, 30 Dec 2024 23:22:49 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Hans Zhang <18255117159@....com>
Cc: kw@...ux.com, kishon@...nel.org, arnd@...db.de,
	gregkh@...uxfoundation.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, rockswang7@...il.com,
	Niklas Cassel <cassel@...nel.org>
Subject: Re: [v3] misc: pci_endpoint_test: Fix return resource_size_t from
 pci_resource_len

On Sat, Dec 21, 2024 at 10:10:09PM +0800, Hans Zhang wrote:

Subject should be improved:

misc: pci_endpoint_test: Fix overflow of bar_size

> With 8GB BAR2, running pcitest -b 2 fails with "TEST FAILED".
> 
> The return value of the `pci_resource_len` interface is not an integer.
> Using `pcitest` with an 8GB BAR2, the bar_size of integer type will
> overflow.
> Change the data type of bar_size from integer to resource_size_t, to fix
> the above issue.
> 
> Signed-off-by: Hans Zhang <18255117159@....com>

With that,

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

- Mani

> Reviewed-by: Niklas Cassel <cassel@...nel.org>
> 
> ---
> Changes since v2:
> https://lore.kernel.org/linux-pci/20241220075253.16791-1-18255117159@163.com/
> 
> - Fix "changes" part goes below the --- line
> - The patch commit message were modified.
> 
> Changes since v1:
> https://lore.kernel.org/linux-pci/20241217121220.19676-1-18255117159@163.com/
> 
> - The patch subject and commit message were modified.
> ---
>  drivers/misc/pci_endpoint_test.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
> index 3aaaf47fa4ee..414c4e55fb0a 100644
> --- a/drivers/misc/pci_endpoint_test.c
> +++ b/drivers/misc/pci_endpoint_test.c
> @@ -280,10 +280,11 @@ static int pci_endpoint_test_bar_memcmp(struct pci_endpoint_test *test,
>  static bool pci_endpoint_test_bar(struct pci_endpoint_test *test,
>  				  enum pci_barno barno)
>  {
> -	int j, bar_size, buf_size, iters, remain;
>  	void *write_buf __free(kfree) = NULL;
>  	void *read_buf __free(kfree) = NULL;
>  	struct pci_dev *pdev = test->pdev;
> +	int j, buf_size, iters, remain;
> +	resource_size_t bar_size;
>  
>  	if (!test->bar[barno])
>  		return false;
> -- 
> 2.25.1
> 

-- 
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