linux-kernel - Re: [PATCH] can: etas_es58x: Add check for alloc_can_err

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Message-ID: <4d953daf-f426-e2fe-ca27-6da30fddaa40@suse.de>
Date:   Fri, 1 Sep 2023 14:12:25 +0300
From:   Denis Kirjanov <dkirjanov@...e.de>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>, mailhol.vincent@...adoo.fr,
        wg@...ndegger.com, mkl@...gutronix.de, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        arunachalam.santhanam@...bosch.com
Cc:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] can: etas_es58x: Add check for alloc_can_err_skb



On 9/1/23 11:27, Jiasheng Jiang wrote:
> Add check for the return value of alloc_can_err_skb in order to
> avoid NULL pointer dereference.
> 
> Fixes: 8537257874e9 ("can: etas_es58x: add core support for ETAS ES58X CAN USB interfaces")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---
>  drivers/net/can/usb/etas_es58x/es58x_core.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/can/usb/etas_es58x/es58x_core.c b/drivers/net/can/usb/etas_es58x/es58x_core.c
> index 0c7f7505632c..d694cb22d9f4 100644
> --- a/drivers/net/can/usb/etas_es58x/es58x_core.c
> +++ b/drivers/net/can/usb/etas_es58x/es58x_core.c
> @@ -680,6 +680,8 @@ int es58x_rx_err_msg(struct net_device *netdev, enum es58x_err error,
>  	}
>  
>  	skb = alloc_can_err_skb(netdev, &cf);
> +	if (!skb)
> +		return -ENOMEM;

Should you adjust the stats for dropped packets as well?

>  
>  	switch (error) {
>  	case ES58X_ERR_OK:	/* 0: No error */