linux-kernel - Re: [PATCH] base: dd: fix error return code of driver_sysfs

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Date:   Tue, 23 Mar 2021 14:57:11 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jia-Ju Bai <baijiaju1990@...il.com>
Cc:     rafael@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] base: dd: fix error return code of driver_sysfs_add()

On Fri, Mar 05, 2021 at 02:24:05AM -0800, Jia-Ju Bai wrote:
> When device_create_file() fails and returns a non-zero value, 
> no error return code of driver_sysfs_add() is assigned.
> To fix this bug, ret is assigned with the return value of
> device_create_file(), and then ret is checked.
> 
> Reported-by: TOTE Robot <oslab@...nghua.edu.cn>
> Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
> ---
>  drivers/base/dd.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
> index 9179825ff646..f94bbef95258 100644
> --- a/drivers/base/dd.c
> +++ b/drivers/base/dd.c
> @@ -413,8 +413,11 @@ static int driver_sysfs_add(struct device *dev)
>  	if (ret)
>  		goto rm_dev;
>  
> -	if (!IS_ENABLED(CONFIG_DEV_COREDUMP) || !dev->driver->coredump ||
> -	    !device_create_file(dev, &dev_attr_coredump))
> +	if (!IS_ENABLED(CONFIG_DEV_COREDUMP) || !dev->driver->coredump)
> +		return 0;
> +	

Trailing whitespace :(