linux-kernel - Re: [PATCH] staging: unisys: Properly test debugfs_create

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Message-ID: <YjmNIX4RsbG8LpyF@kroah.com>
Date:   Tue, 22 Mar 2022 09:47:29 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Cc:     David Kershner <david.kershner@...sys.com>,
        sparmaintainer@...sys.com, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: unisys: Properly test debugfs_create_dir()
 return values

On Tue, Mar 22, 2022 at 09:38:58AM +0100, Fabio M. De Francesco wrote:
> debugfs_create_dir() returns a pointers to a dentry objects. On failures
> it returns errors. Currently the values returned to visornic_probe()
> seem to be tested for being equal to NULL in case of failures.
> 
> Properly test with "if (IS_ERR())" and then assign the correct error 
> value to the "err" variable.
> 
> Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
> ---
>  drivers/staging/unisys/visornic/visornic_main.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/unisys/visornic/visornic_main.c b/drivers/staging/unisys/visornic/visornic_main.c
> index 643432458105..58d03f3d3173 100644
> --- a/drivers/staging/unisys/visornic/visornic_main.c
> +++ b/drivers/staging/unisys/visornic/visornic_main.c
> @@ -1922,11 +1922,11 @@ static int visornic_probe(struct visor_device *dev)
>  	/* create debug/sysfs directories */
>  	devdata->eth_debugfs_dir = debugfs_create_dir(netdev->name,
>  						      visornic_debugfs_dir);
> -	if (!devdata->eth_debugfs_dir) {
> +	if (IS_ERR(devdata->eth_debugfs_dir)) {

We really shouldn't be checking this value at all.  There's no reason to
check the return value of a debugfs_* call.  Can you fix up the code to
do that instead?

thanks,

greg k-h