linux-kernel - Re: Re: [PATCH] input/serio: Fix refcount leak bug in i8042-sparcio

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Message-ID: <YsuWuJTQsMlQabqt@google.com>
Date:   Sun, 10 Jul 2022 20:19:20 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Liang He <windhl@....com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Re: [PATCH] input/serio: Fix refcount leak bug in i8042-sparcio

On Sun, Jul 10, 2022 at 09:37:10AM +0800, Liang He wrote:
> At 2022-07-09 12:49:23, "Dmitry Torokhov" <dmitry.torokhov@...il.com> wrote:
> >Hi Liang,
> >
> >On Sun, Jun 19, 2022 at 03:30:36PM +0800, Liang He wrote:
> >> In i8042_platform_init() and i8042_platform_exit(), we need call
> >> of_node_put() to keep refcount balance.
> >> 
> >> Signed-off-by: Liang He <windhl@....com>
> >> ---
> >>  drivers/input/serio/i8042-sparcio.h | 4 ++++
> >>  1 file changed, 4 insertions(+)
> >> 
> >> diff --git a/drivers/input/serio/i8042-sparcio.h b/drivers/input/serio/i8042-sparcio.h
> >> index fce76812843b..a2a9db9220d7 100644
> >> --- a/drivers/input/serio/i8042-sparcio.h
> >> +++ b/drivers/input/serio/i8042-sparcio.h
> >> @@ -108,6 +108,8 @@ static int __init i8042_platform_init(void)
> >>  	struct device_node *root = of_find_node_by_path("/");
> >>  	const char *name = of_get_property(root, "name", NULL);
> >>  
> >> +	of_node_put(root);
> >> +
> >>  	if (name && !strcmp(name, "SUNW,JavaStation-1")) {
> >>  		/* Hardcoded values for MrCoffee.  */
> >>  		i8042_kbd_irq = i8042_aux_irq = 13 | 0x20;
> >> @@ -139,6 +141,8 @@ static inline void i8042_platform_exit(void)
> >>  	struct device_node *root = of_find_node_by_path("/");
> >>  	const char *name = of_get_property(root, "name", NULL);
> >>  
> >> +	of_node_put(root);
> >> +
> >>  	if (!name || strcmp(name, "SUNW,JavaStation-1"))
> >>  		platform_driver_unregister(&sparc_i8042_driver);
> >>  }
> >
> >There already was an attempt to fix this issue in a slightly better way,
> >unfortunately the original author did not finish the work:
> >
> >https://lore.kernel.org/all/20181212163548.23723-1-tiny.windzz@gmail.com/
> >
> >Thanks.
> >
> >-- 
> >Dmitry
> 
> Hi, Dmirtry,
> 
> Thanks for reviewing my patch code.
> 
> The Li's patch adds a helper and is better than mine.

Right, however there is a compile error in Li's version. It would be
great if someone could finish their work.

Thanks.

-- 
Dmitry