linux-kernel - Re: [PATCH v2] net: mana: Fix possible double free in error handling path

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Date: Tue, 25 Jun 2024 11:13:41 +0200
From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
To: Ma Ke <make24@...as.ac.cn>
CC: <linux-hyperv@...r.kernel.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <kys@...rosoft.com>,
	<haiyangz@...rosoft.com>, <wei.liu@...nel.org>, <decui@...rosoft.com>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <shradhagupta@...ux.microsoft.com>, <horms@...nel.org>,
	<kotaranov@...rosoft.com>, <schakrabarti@...ux.microsoft.com>,
	<erick.archer@...look.com>
Subject: Re: [PATCH v2] net: mana: Fix possible double free in error handling
 path

On 6/25/24 10:38, Ma Ke wrote:
> When auxiliary_device_add() returns error and then calls
> auxiliary_device_uninit(), callback function adev_release
> calls kfree(madev). We shouldn't call kfree(madev) again
> in the error handling path. Set 'madev' to NULL.
> 
> Signed-off-by: Ma Ke <make24@...as.ac.cn>
> ---
> Changes in v2:
> - streamlined the patch according suggestions;
> - revised the description.
> ---
>   drivers/net/ethernet/microsoft/mana/mana_en.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
> index d087cf954f75..608ad31a9702 100644
> --- a/drivers/net/ethernet/microsoft/mana/mana_en.c
> +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
> @@ -2798,6 +2798,8 @@ static int add_adev(struct gdma_dev *gd)
>   	if (ret)
>   		goto init_fail;
>   
> +	/* madev is owned by the auxiliary device */
> +	madev = NULL;
>   	ret = auxiliary_device_add(adev);
>   	if (ret)
>   		goto add_fail;

Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>