linux-kernel - Re: [PATCH] ata: libahci_platform: Add of_node

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <159af6e4-90cb-bf10-8186-18f95f6a6f80@redhat.com>
Date:   Thu, 15 Aug 2019 10:55:32 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Nishka Dasgupta <nishkadg.linux@...il.com>, axboe@...nel.dk,
        linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ata: libahci_platform: Add of_node_put() before loop exit

Hi,

On 15-08-19 08:00, Nishka Dasgupta wrote:
> Each iteration of for_each_child_of_node puts the previous node, but
> in the case of a goto from the middle of the loop, there is no put,
> thus causing a memory leak. Add an of_node_put before three such goto
> statements.
> Issue found with Coccinelle.
> 
> Signed-off-by: Nishka Dasgupta <nishkadg.linux@...il.com>

I really believe the for_each_child_of_node semantics are broken, see my
other reply. But that is no reason not to fix this, so this is:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans


> ---
>   drivers/ata/libahci_platform.c | 9 +++++++--
>   1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
> index 9e9583a6bba9..e742780950de 100644
> --- a/drivers/ata/libahci_platform.c
> +++ b/drivers/ata/libahci_platform.c
> @@ -497,6 +497,7 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,
>   
>   			if (of_property_read_u32(child, "reg", &port)) {
>   				rc = -EINVAL;
> +				of_node_put(child);
>   				goto err_out;
>   			}
>   
> @@ -514,14 +515,18 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,
>   			if (port_dev) {
>   				rc = ahci_platform_get_regulator(hpriv, port,
>   								&port_dev->dev);
> -				if (rc == -EPROBE_DEFER)
> +				if (rc == -EPROBE_DEFER) {
> +					of_node_put(child);
>   					goto err_out;
> +				}
>   			}
>   #endif
>   
>   			rc = ahci_platform_get_phy(hpriv, port, dev, child);
> -			if (rc)
> +			if (rc) {
> +				of_node_put(child);
>   				goto err_out;
> +			}
>   
>   			enabled_ports++;
>   		}
>