linux-kernel - Re: [PATCH] ionic: fix memory leak in ionic

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Message-ID: <8bf36e1e-5f05-4727-9cbd-8dc0a97561a6@amd.com>
Date: Tue, 5 Nov 2024 09:56:27 -0800
From: "Nelson, Shannon" <shannon.nelson@....com>
To: Wentao Liang <Wentao_liang_g@....com>, brett.creeley@....com,
 davem@...emloft.net, kuba@...nel.org
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ionic: fix memory leak in ionic_probe

On 11/4/2024 9:34 PM, Wentao Liang wrote:
> 

Your Subject line should include the code tree this is aimed at - in 
this case, probably "net".  And since this would be an update, you'll 
also want to include a "v2" to indicate that it is a 2nd version of the 
patch.

> In line 334, the ionic_setup_one() creates a debugfs entry for
> ionic upon successful execution. However, the ionic_probe() does
> not release the dentry before returning, resulting in a memory
> leak. To fix this bug, we add the ionic_debugfs_del_dev() before
> line 397 to release the resources before the function returns.
> 

Please include a "Fixes" tag with a pointer to the commit that 
introduced the problem.

> Signed-off-by: Wentao Liang <Wentao_liang_g@....com>
> ---
>   drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c b/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c
> index b93791d6b593..f5dc876eb500 100644
> --- a/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c
> +++ b/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c
> @@ -394,6 +394,7 @@ static int ionic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>   err_out_pci:
>          ionic_dev_teardown(ionic);
>          ionic_clear_pci(ionic);
> +       ionic_debugfs_del_dev(ionic);

This leak should get cleaned up by the ionic_debugfs_destroy() call in 
ionic_cleanup_module(), but only if someone was to rmmod the driver. 
This is a good thing to add for tidiness - thanks for catching it.

sln

>   err_out:
>          mutex_destroy(&ionic->dev_cmd_lock);
>          ionic_devlink_free(ionic);
> --
> 2.42.0.windows.2
>