linux-kernel - Re: [PATCH] pinctrl:sunplus: Add check for kmalloc

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Message-ID: <381c7339-685c-8973-ecf2-5a34cd18cda3@wanadoo.fr>
Date:   Thu, 25 May 2023 22:00:34 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Dan Carpenter <dan.carpenter@...aro.org>
Cc:     andy.shevchenko@...il.com,
        Wells Lu 呂芳騰 <wells.lu@...plus.com>,
        Wells Lu <wellslutw@...il.com>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl:sunplus: Add check for kmalloc

Le 25/05/2023 à 21:19, Dan Carpenter a écrit :
> On Tue, May 23, 2023 at 10:05:49PM +0200, Christophe JAILLET wrote:
>> Should be looked at more carefully, but
>>    dt_to_map_one_config		(in /drivers/pinctrl/devicetree.c)
>>      .dt_node_to_map
>>        --> sppctl_dt_node_to_map
>>
>> Should dt_to_map_one_config() fail, pinctrl_dt_free_maps() is called
>> (see https://elixir.bootlin.com/linux/v6.4-rc1/source/drivers/pinctrl/devicetree.c#L281)
> 
> Thanks for this call tree, I don't have this file enabled in my build
> so it's not easy for me to find how sppctl_dt_node_to_map() was called.
> 
> drivers/pinctrl/devicetree.c
>     160                  dev_err(p->dev, "pctldev %s doesn't support DT\n",
>     161                          dev_name(pctldev->dev));
>     162                  return -ENODEV;
>     163          }
>     164          ret = ops->dt_node_to_map(pctldev, np_config, &map, &num_maps);
>                                                                ^^^^
> "map" isn't stored anywhere so it will be leaked.  I guess kmemleak
> already figured this out.
> 
>     165          if (ret < 0)
>     166                  return ret;
>     167          else if (num_maps == 0) {
>     168                  /*
> 

Hi, thanks Dan for sharing your PoV on this.

CJ