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From: Lee Jones <lee.jones@linaro.org>
To: Marc Zyngier <maz@kernel.org>
Cc: linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Arnd Bergmann <arnd@arndb.de>, Suman Anna <s-anna@ti.com>,
	kernel-team@android.com
Subject: Re: [PATCH] mfd: syscon: Don't free allocated name for regmap_config
Date: Tue, 8 Sep 2020 09:22:34 +0100	[thread overview]
Message-ID: <20200908082234.GD4400@dell> (raw)
In-Reply-To: <20200903160237.932818-1-maz@kernel.org>

On Thu, 03 Sep 2020, Marc Zyngier wrote:

> The name allocated for the regmap_config structure is freed
> pretty early, right after the registration of the MMIO region.
> 
> Unfortunately, that doesn't follow the life cycle that debugfs
> expects, as it can access the name field long after the free
> has occured.
> 
> Move the free on the error path, and keep it forever otherwise.
> 
> Fixes: e15d7f2b81d2 ("mfd: syscon: Use a unique name with regmap_config")
> Signed-off-by: Marc Zyngier <maz@kernel.org>
> ---
>  drivers/mfd/syscon.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Does this work for you Suman, Arnd?

> diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
> index 75859e492984..7a660411c562 100644
> --- a/drivers/mfd/syscon.c
> +++ b/drivers/mfd/syscon.c
> @@ -108,7 +108,6 @@ static struct syscon *of_syscon_register(struct device_node *np, bool check_clk)
>  	syscon_config.max_register = resource_size(&res) - reg_io_width;
>  
>  	regmap = regmap_init_mmio(NULL, base, &syscon_config);
> -	kfree(syscon_config.name);
>  	if (IS_ERR(regmap)) {
>  		pr_err("regmap init failed\n");
>  		ret = PTR_ERR(regmap);
> @@ -145,6 +144,7 @@ static struct syscon *of_syscon_register(struct device_node *np, bool check_clk)
>  	regmap_exit(regmap);
>  err_regmap:
>  	iounmap(base);
> +	kfree(syscon_config.name);
>  err_map:
>  	kfree(syscon);
>  	return ERR_PTR(ret);

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog

WARNING: multiple messages have this Message-ID (diff)
From: Lee Jones <lee.jones@linaro.org>
To: Marc Zyngier <maz@kernel.org>
Cc: kernel-team@android.com, Arnd Bergmann <arnd@arndb.de>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] mfd: syscon: Don't free allocated name for regmap_config
Date: Tue, 8 Sep 2020 09:22:34 +0100	[thread overview]
Message-ID: <20200908082234.GD4400@dell> (raw)
In-Reply-To: <20200903160237.932818-1-maz@kernel.org>

On Thu, 03 Sep 2020, Marc Zyngier wrote:

> The name allocated for the regmap_config structure is freed
> pretty early, right after the registration of the MMIO region.
> 
> Unfortunately, that doesn't follow the life cycle that debugfs
> expects, as it can access the name field long after the free
> has occured.
> 
> Move the free on the error path, and keep it forever otherwise.
> 
> Fixes: e15d7f2b81d2 ("mfd: syscon: Use a unique name with regmap_config")
> Signed-off-by: Marc Zyngier <maz@kernel.org>
> ---
>  drivers/mfd/syscon.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Does this work for you Suman, Arnd?

> diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
> index 75859e492984..7a660411c562 100644
> --- a/drivers/mfd/syscon.c
> +++ b/drivers/mfd/syscon.c
> @@ -108,7 +108,6 @@ static struct syscon *of_syscon_register(struct device_node *np, bool check_clk)
>  	syscon_config.max_register = resource_size(&res) - reg_io_width;
>  
>  	regmap = regmap_init_mmio(NULL, base, &syscon_config);
> -	kfree(syscon_config.name);
>  	if (IS_ERR(regmap)) {
>  		pr_err("regmap init failed\n");
>  		ret = PTR_ERR(regmap);
> @@ -145,6 +144,7 @@ static struct syscon *of_syscon_register(struct device_node *np, bool check_clk)
>  	regmap_exit(regmap);
>  err_regmap:
>  	iounmap(base);
> +	kfree(syscon_config.name);
>  err_map:
>  	kfree(syscon);
>  	return ERR_PTR(ret);

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2020-09-08  8:22 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-03 16:02 [PATCH] mfd: syscon: Don't free allocated name for regmap_config Marc Zyngier
2020-09-03 16:02 ` Marc Zyngier
2020-09-08  8:22 ` Lee Jones [this message]
2020-09-08  8:22   ` Lee Jones
2020-09-24 12:39 ` Lee Jones
2020-09-24 12:39   ` Lee Jones
2020-09-26  0:28   ` Suman Anna
2020-09-26  0:28     ` Suman Anna
2020-09-28  9:19     ` Lee Jones
2020-09-28  9:19       ` Lee Jones
2021-02-16  6:34 ` Tomi Valkeinen
2021-02-16  6:34   ` Tomi Valkeinen
2021-02-16  8:42   ` Marc Zyngier
2021-02-16  8:42     ` Marc Zyngier

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