[PATCH] ata: libahci_platform: Fix device reference leak in ahci_platform_get_resources()

[PATCH] ata: libahci_platform: Fix device reference leak in ahci_platform_get_resources()

[Wentao Liang]

of_find_device_by_node() takes a reference on the port platform device,
which is only used to look up its port regulator and is never released,
neither on success nor on the error paths. Drop the reference with
put_device() once the regulator has been obtained, which covers both the
success and error paths.

Fixes: c7d7ddee7e24 ("ata: libahci: Allow using multiple regulators")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
 drivers/ata/libahci_platform.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
index 6e072d681341..14a47e0bddd4 100644
--- a/drivers/ata/libahci_platform.c
+++ b/drivers/ata/libahci_platform.c
@@ -624,6 +624,7 @@ 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);
+				put_device(&port_dev->dev);
 				if (rc == -EPROBE_DEFER)
 					goto err_out;
 			}
-- 
2.34.1

Re: [PATCH] ata: libahci_platform: Fix device reference leak in ahci_platform_get_resources()

[Niklas Cassel]

On Tue, 15 Sep 2026 06:59:33 +0000, Wentao Liang wrote:
> of_find_device_by_node() takes a reference on the port platform device,
> which is only used to look up its port regulator and is never released,
> neither on success nor on the error paths. Drop the reference with
> put_device() once the regulator has been obtained, which covers both the
> success and error paths.
> 
> 
> [...]

Applied to libata/linux.git (for-7.3-fixes), thanks!

[1/1] ata: libahci_platform: Fix device reference leak in ahci_platform_get_resources()
      https://git.kernel.org/libata/linux/c/26ca58db

Kind regards,
Niklas

Re: [PATCH] ata: libahci_platform: Fix device reference leak in ahci_platform_get_resources()

[Damien Le Moal]

On 2026/09/15 13:59, Wentao Liang wrote:
> of_find_device_by_node() takes a reference on the port platform device,
> which is only used to look up its port regulator and is never released,
> neither on success nor on the error paths. Drop the reference with
> put_device() once the regulator has been obtained, which covers both the
> success and error paths.
> 
> Fixes: c7d7ddee7e24 ("ata: libahci: Allow using multiple regulators")
> Cc: stable@vger.kernel.org
> Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
> ---
>  drivers/ata/libahci_platform.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
> index 6e072d681341..14a47e0bddd4 100644
> --- a/drivers/ata/libahci_platform.c
> +++ b/drivers/ata/libahci_platform.c
> @@ -624,6 +624,7 @@ 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);
> +				put_device(&port_dev->dev);

Looks good. But while at it, please remove the blank line between the call to
of_find_device_by_node() and the if.

With that done,

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>


>  				if (rc == -EPROBE_DEFER)
>  					goto err_out;
>  			}


-- 
Damien Le Moal
Western Digital Research

Re: [PATCH] ata: libahci_platform: Fix device reference leak in ahci_platform_get_resources()

[Niklas Cassel]

On Tue, Sep 15, 2026 at 11:22:11AM +0200, Niklas Cassel wrote:
> On Tue, 15 Sep 2026 06:59:33 +0000, Wentao Liang wrote:
> > of_find_device_by_node() takes a reference on the port platform device,
> > which is only used to look up its port regulator and is never released,
> > neither on success nor on the error paths. Drop the reference with
> > put_device() once the regulator has been obtained, which covers both the
> > success and error paths.
> > 
> > 
> > [...]
> 
> Applied to libata/linux.git (for-7.3-fixes), thanks!
> 
> [1/1] ata: libahci_platform: Fix device reference leak in ahci_platform_get_resources()
>       https://git.kernel.org/libata/linux/c/26ca58db

Wentao,

Since your commit was top of tree, I took the liberty to amend your commit
to address Damien's review comment and to pick up his R-b tag, new SHA1:

https://git.kernel.org/libata/linux/c/0d1cb833


Kind regards,
Niklas