linux-kernel - Re: [PATCH] net: davicom: Fix return type of dm9000_start

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Message-ID: <YyEEO0ttQhMvLFIC@dev-arch.thelio-3990X>
Date:   Tue, 13 Sep 2022 15:29:15 -0700
From:   Nathan Chancellor <nathan@...nel.org>
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>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: davicom: Fix return type of dm9000_start_xmit

On Mon, Sep 12, 2022 at 12:47:19PM -0700, 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 dm9000_start_xmit should be changed from int to
> netdev_tx_t.
> 
> Reported-by: Dan Carpenter <error27@...il.com>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1703
> Cc: llvm@...ts.linux.dev
> Signed-off-by: Nathan Huckleberry <nhuck@...gle.com>

Reviewed-by: Nathan Chancellor <nathan@...nel.org>

> ---
>  drivers/net/ethernet/davicom/dm9000.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/davicom/dm9000.c b/drivers/net/ethernet/davicom/dm9000.c
> index 0985ab216566..186a5e0a7862 100644
> --- a/drivers/net/ethernet/davicom/dm9000.c
> +++ b/drivers/net/ethernet/davicom/dm9000.c
> @@ -1012,7 +1012,7 @@ static void dm9000_send_packet(struct net_device *dev,
>   *  Hardware start transmission.
>   *  Send a packet to media from the upper layer.
>   */
> -static int
> +static netdev_tx_t
>  dm9000_start_xmit(struct sk_buff *skb, struct net_device *dev)
>  {
>  	unsigned long flags;
> -- 
> 2.37.2.789.g6183377224-goog
>