linux-kernel - Re: [PATCH] arm:cache-l2x0: Fix resource leak in the l2x0_of

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Message-ID: <efd37eb7-cfec-f974-19f1-e90cc7d7c268@huawei.com>
Date:   Thu, 18 Aug 2022 09:25:53 +0800
From:   Xiaoming Ni <nixiaoming@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux@...linux.org.uk>,
        <arnd@...db.de>, <olof@...om.net>, <21cnbao@...il.com>,
        <grant.likely@...retlab.ca>, <santosh.shilimkar@...com>,
        <m.szyprowski@...sung.com>, <tony@...mide.com>,
        <t.figa@...sung.com>, <linux-arm-kernel@...ts.infradead.org>
CC:     <wangle6@...wei.com>
Subject: Re: [PATCH] arm:cache-l2x0: Fix resource leak in the l2x0_of_init()
 failed branch

ping

On 2021/11/8 12:05, Xiaoming Ni wrote:
> During the code review, some problems were found in the function l2x0_of_init().
> 1. Do not call Of_put_node() after calling of_find_match_node().
> 2. When __l2c_init() is called for identification, l2x0_base is not released.
> 
> Invoking Of_put_node() and iounmap() is added to solve this problem.
> 
> Fixes: 8c369264b6de3 ("ARM: 7009/1: l2x0: Add OF based initialization")
> Fixes: 91c2ebb90b189 ("ARM: 7114/1: cache-l2x0: add resume entry for l2 in secure mode")
> Fixes: 6b49241ac2525 ("ARM: 8259/1: l2c: Refactor the driver to use commit-like interface")
> Signed-off-by: Xiaoming Ni <nixiaoming@...wei.com>
> ---
>   arch/arm/mm/cache-l2x0.c | 17 ++++++++++++++---
>   1 file changed, 14 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
> index 43d91bfd2360..105bf7575cdf 100644
> --- a/arch/arm/mm/cache-l2x0.c
> +++ b/arch/arm/mm/cache-l2x0.c
> @@ -1766,17 +1766,22 @@ int __init l2x0_of_init(u32 aux_val, u32 aux_mask)
>   	u32 cache_id, old_aux;
>   	u32 cache_level = 2;
>   	bool nosync = false;
> +	int ret;
>   
>   	np = of_find_matching_node(NULL, l2x0_ids);
>   	if (!np)
>   		return -ENODEV;
>   
> -	if (of_address_to_resource(np, 0, &res))
> +	if (of_address_to_resource(np, 0, &res)) {
> +		of_put_node(np);
>   		return -ENODEV;
> +	}
>   
>   	l2x0_base = ioremap(res.start, resource_size(&res));
> -	if (!l2x0_base)
> +	if (!l2x0_base) {
> +		of_put_node(np);
>   		return -ENOMEM;
> +	}
>   
>   	l2x0_saved_regs.phy_base = res.start;
>   
> @@ -1820,6 +1825,12 @@ int __init l2x0_of_init(u32 aux_val, u32 aux_mask)
>   	else
>   		cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
>   
> -	return __l2c_init(data, aux_val, aux_mask, cache_id, nosync);
> +	ret = _l2c_init(data, aux_val, aux_mask, cache_id, nosync);
> +	if (ret != 0) {
> +		iounmap(l2x0_base);
> +		l2x0_base = NULL;
> +	}
> +	of_put_node(np);
> +	return ret;
>   }
>   #endif
>