netdev - Re: [PATCH] nfc: change order inside nfc_se

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Message-ID: <7370a80b-56f9-a858-ff05-5ba9d7206c8c@linaro.org>
Date:   Mon, 6 Mar 2023 16:28:12 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Fedor Pchelkin <pchelkin@...ras.ru>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Alexey Khoroshilov <khoroshilov@...ras.ru>,
        lvc-project@...uxtesting.org
Subject: Re: [PATCH] nfc: change order inside nfc_se_io error path

On 04/03/2023 17:48, Fedor Pchelkin wrote:
> cb_context should be freed on error paths in nfc_se_io as stated by commit
> 25ff6f8a5a3b ("nfc: fix memory leak of se_io context in nfc_genl_se_io").
> 
> Make the error path in nfc_se_io unwind everything in reverse order, i.e.
> free the cb_context after unlocking the device.
> 
> No functional changes intended - only adjusting to good coding practice.

I would argue that it is functional. Running code in or outside of
critical section/locks is quite functional change.

> 
> Suggested-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Signed-off-by: Fedor Pchelkin <pchelkin@...ras.ru>
> ---
>  net/nfc/netlink.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
> index 348bf561bc9f..b9264e730fd9 100644
> --- a/net/nfc/netlink.c
> +++ b/net/nfc/netlink.c
> @@ -1446,8 +1446,8 @@ static int nfc_se_io(struct nfc_dev *dev, u32 se_idx,
>  	return rc;
>  
>  error:
> -	kfree(cb_context);
>  	device_unlock(&dev->dev);
> +	kfree(cb_context);


Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

>  

Best regards,
Krzysztof