linux-kernel - Re: [PATCH] ide: pci: Fix memleak in ide_pci_init

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Date:   Sun, 20 Dec 2020 21:50:33 +0200
From:   Kari Argillander <kari.argillander@...il.com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     kjlu@....edu, "David S. Miller" <davem@...emloft.net>,
        linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ide: pci: Fix memleak in ide_pci_init_two

On Sun, Dec 20, 2020 at 03:05:40PM +0800, Dinghao Liu wrote:
> When do_ide_setup_pci_device() fails, host allocated
> by ide_host_alloc() may not have been freed, which
> leads to memleak.
> 
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---
>  drivers/ide/setup-pci.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/ide/setup-pci.c b/drivers/ide/setup-pci.c
> index fdc8e813170c..c7da5368fcd4 100644
> --- a/drivers/ide/setup-pci.c
> +++ b/drivers/ide/setup-pci.c
> @@ -586,7 +586,7 @@ int ide_pci_init_two(struct pci_dev *dev1, struct pci_dev *dev2,
>  		 * do_ide_setup_pci_device() on the first device!
>  		 */
>  		if (ret < 0)
> -			goto out_free_bars;
> +			goto out_free_host;
>  
>  		/* fixup IRQ */
>  		if (ide_pci_is_in_compatibility_mode(pdev[i])) {
> @@ -597,11 +597,11 @@ int ide_pci_init_two(struct pci_dev *dev1, struct pci_dev *dev2,
>  	}
>  
>  	ret = ide_host_register(host, d, hws);
> -	if (ret)
> -		ide_host_free(host);
> -	else
> +	if (!ret)
>  		goto out;

Maybe 
	if (ret)
		goto out_free_host;

	return 0;

would be more clear here. But this is just small nit.

>  
> +out_free_host:
> +	ide_host_free(host);
>  out_free_bars:
>  	i = n_ports / 2;
>  	while (i--)