netdev - Re: [PATCH] net: ll_temac: platform_get_resource replaced by wrong function

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Message-ID: <20240320115433.GT185808@kernel.org>
Date: Wed, 20 Mar 2024 11:54:33 +0000
From: Simon Horman <horms@...nel.org>
To: Claus Hansen Ries <chr@...ma.com>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Michal Simek <michal.simek@....com>, Alex Elder <elder@...aro.org>,
	Wei Fang <wei.fang@....com>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	Rob Herring <robh@...nel.org>, Wang Hai <wanghai38@...wei.com>
Subject: Re: [PATCH] net: ll_temac: platform_get_resource replaced by wrong
 function

+ Eric Dumazet, Jakub Kicinski, Paolo Abeni, Michal Simek, Alex Elder
  Wei Fang, Uwe Kleine-König, Dan Carpenter, Rob Herring, Wang Hai

On Tue, Mar 19, 2024 at 07:45:26PM +0000, Claus Hansen Ries wrote:
> From: Claus Hansen ries <chr@...ma.com>
> 
> devm_platform_ioremap_resource_byname is called using 0 as name, which eventually 
> ends up in platform_get_resource_byname, where it causes a null pointer in strcmp.
> 
>                 if (type == resource_type(r) && !strcmp(r->name, name))
> 
> The correct function is devm_platform_ioremap_resource.

Hi Claus,

It is curious that this wasn't noticed earlier - does the driver
function in some circumstances without this change?

> 
> Fixes: bd69058 ("net: ll_temac: Use devm_platform_ioremap_resource_byname()")

nit: Fixes tags should use 12 or more characters for the hash.

Fixes: bd69058f50d5 ("net: ll_temac: Use devm_platform_ioremap_resource_byname()")

> Signed-off-by: Claus H. Ries <chr@...ma.com>
> Cc: stable@...r.kernel.org

Unfortunately the patch does not apply - it seems that tabs have been
replaced by spaces somewhere along the way. It would be best to repost
with that addressed. Using git send-email usually works.

Also, as this is a fix, please target it at the net tree.
That means it should be based on that tree (that part is fine :)
and designated as being for net in the subject.

	Subject: [PATCH net] ...

Lastly, please run get_maintainer.pl on your patch to provide the list
of parties to CC.

https://docs.kernel.org/process/maintainer-netdev.html

> ---
>  drivers/net/ethernet/xilinx/ll_temac_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c
> index 9df39cf8b097..1072e2210aed 100644
> --- a/drivers/net/ethernet/xilinx/ll_temac_main.c
> +++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
> @@ -1443,7 +1443,7 @@ static int temac_probe(struct platform_device *pdev)
>         }
>           /* map device registers */
> -       lp->regs = devm_platform_ioremap_resource_byname(pdev, 0);
> +       lp->regs = devm_platform_ioremap_resource(pdev, 0);
>         if (IS_ERR(lp->regs)) {
>                 dev_err(&pdev->dev, "could not map TEMAC registers\n");
>                 return -ENOMEM;
> 
> base-commit: d95fcdf4961d27a3d17e5c7728367197adc89b8d
> --  2.39.3 (Apple Git-146)
> 
> 
> 

-- 
pw-bot: changes-requested