linux-kernel - Re: [PATCH] can: mcp251xfd: fix wrong check in mcp251xfd_handle_rxif

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Message-ID: <20210113075737.GA3763@thinkpad>
Date:   Wed, 13 Jan 2021 13:27:37 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Qinglang Miao <miaoqinglang@...wei.com>
Cc:     Marc Kleine-Budde <mkl@...gutronix.de>,
        Thomas Kopp <thomas.kopp@...rochip.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] can: mcp251xfd: fix wrong check in
 mcp251xfd_handle_rxif_one

On Wed, Jan 13, 2021 at 03:31:00PM +0800, Qinglang Miao wrote:
> If alloc_canfd_skb returns NULL, 'cfg' is an uninitialized
> variable, so we should check 'skb' rather than 'cfd' after
> calling alloc_canfd_skb(priv->ndev, &cfd).
> 
> Fixes: 55e5b97f003e ("can: mcp25xxfd: add driver for Microchip MCP25xxFD SPI CAN")
> Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Thanks,
Mani

> ---
>  drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
> index 77129d5f4..792d55ba4 100644
> --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
> +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
> @@ -1492,7 +1492,7 @@ mcp251xfd_handle_rxif_one(struct mcp251xfd_priv *priv,
>  	else
>  		skb = alloc_can_skb(priv->ndev, (struct can_frame **)&cfd);
>  
> -	if (!cfd) {
> +	if (!skb) {
>  		stats->rx_dropped++;
>  		return 0;
>  	}
> -- 
> 2.23.0
>