linux-kernel - Re: [PATCH] net: ax88796c: Fix return type of ax88796c_start

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Date:   Mon, 12 Sep 2022 22:19:07 +0200
From:   Lukasz Stelmach <l.stelmach@...sung.com>
To:     Nathan Huckleberry <nhuck@...gle.com>
Cc:     Dan Carpenter <error27@...il.com>, llvm@...ts.linux.dev,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ax88796c: Fix return type of ax88796c_start_xmit

It was <2022-09-12 pon 12:40>, when Nathan Huckleberry wrote:
> The ndo_start_xmit field in net_device_ops is expected to be of type
> netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb, struct net_device *dev).
>
> The mismatched return type breaks forward edge kCFI since the underlying
> function definition does not match the function hook definition.
>
> The return type of ax88796c_start_xmit should be changed from int to
> netdev_tx_t.
>
> Reported-by: Dan Carpenter <error27@...il.com>
> Link: [...]
> Cc: llvm@...ts.linux.dev
> Signed-off-by: Nathan Huckleberry <nhuck@...gle.com>
> ---
>  drivers/net/ethernet/asix/ax88796c_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>

Acked-by: Lukasz Stelmach <l.stelmach@...sung.com>

> diff --git a/drivers/net/ethernet/asix/ax88796c_main.c b/drivers/net/ethernet/asix/ax88796c_main.c
> index 6ba5b024a7be..f1d610efd69e 100644
> --- a/drivers/net/ethernet/asix/ax88796c_main.c
> +++ b/drivers/net/ethernet/asix/ax88796c_main.c
> @@ -381,7 +381,7 @@ static int ax88796c_hard_xmit(struct ax88796c_device *ax_local)
>  	return 1;
>  }
>  
> -static int
> +static netdev_tx_t
>  ax88796c_start_xmit(struct sk_buff *skb, struct net_device *ndev)
>  {
>  	struct ax88796c_device *ax_local = to_ax88796c_device(ndev);

-- 
Łukasz Stelmach
Samsung R&D Institute Poland
Samsung Electronics

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