Re: [PATCH] firmware: stratix10-svc: Fix some error handling paths in 'stratix10_svc_drv_probe()'

[Dan Carpenter <dan.carpenter@oracle.com>]

On Sun, Apr 26, 2020 at 09:03:07PM +0200, Christophe JAILLET wrote:
> If an error occurs after calling 'kfifo_alloc()', the allocated memory
> should be freed with 'kfifo_free()', as already done in the remove
> function.
> 
> Fixes: b5dc75c915cd ("firmware: stratix10-svc: extend svc to support new RSU features")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> ---
>  drivers/firmware/stratix10-svc.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/firmware/stratix10-svc.c b/drivers/firmware/stratix10-svc.c
> index d5f0769f3761..cc9df9589195 100644
> --- a/drivers/firmware/stratix10-svc.c
> +++ b/drivers/firmware/stratix10-svc.c
> @@ -1043,24 +1043,31 @@ static int stratix10_svc_drv_probe(struct platform_device *pdev)
>  
>  	/* add svc client device(s) */
>  	svc = devm_kzalloc(dev, sizeof(*svc), GFP_KERNEL);
> -	if (!svc)
> -		return -ENOMEM;
> +	if (!svc) {
> +		ret = -ENOMEM;
> +		goto err_free_kfifo;
> +	}
>  
>  	svc->stratix10_svc_rsu = platform_device_alloc(STRATIX10_RSU, 0);
>  	if (!svc->stratix10_svc_rsu) {
>  		dev_err(dev, "failed to allocate %s device\n", STRATIX10_RSU);
> -		return -ENOMEM;
> +		ret = -ENOMEM;
> +		goto err_free_kfifo;
>  	}
>  
>  	ret = platform_device_add(svc->stratix10_svc_rsu);
>  	if (ret) {
>  		platform_device_put(svc->stratix10_svc_rsu);

Why not move this to the unwind code as well and do "goto put_platform;"?

regards,
dan carpenter

> -		return ret;
> +		goto err_free_kfifo;
>  	}
>  	dev_set_drvdata(dev, svc);
>  
>  	pr_info("Intel Service Layer Driver Initialized\n");
>  
> +	return 0;
> +
> +err_free_kfifo:
> +	kfifo_free(&controller->svc_fifo);
>  	return ret;
>  }