linux-kernel - Re: [PATCH v3] staging: r8188eu: Fix return type of rtw_xmit

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Date:   Thu, 15 Sep 2022 07:22:51 +0200
From:   Philipp Hortmann <philipp.g.hortmann@...il.com>
To:     Nathan Huckleberry <nhuck@...gle.com>, nathan@...nel.org
Cc:     Larry.Finger@...inger.net, error27@...il.com,
        gregkh@...uxfoundation.org, insafonov@...il.com,
        linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev,
        llvm@...ts.linux.dev, makvihas@...il.com, namcaov@...il.com,
        ndesaulniers@...gle.com, paskripkin@...il.com,
        phil@...lpotter.co.uk, saurav.girepunje@...il.com, trix@...hat.com
Subject: Re: [PATCH v3] staging: r8188eu: Fix return type of rtw_xmit_entry

On 9/14/22 23:16, 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 rtw_xmit_entry 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>
> ---
> 
> Changes v1 -> v2:
> - Rebased onto linux-next/master
> 
> Changes v2 -> v3:
> - Updated header file
> - Add reviewed-by tag
> 
>   drivers/staging/r8188eu/core/rtw_xmit.c    | 4 ++--
>   drivers/staging/r8188eu/include/rtw_xmit.h | 2 +-
>   2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/staging/r8188eu/core/rtw_xmit.c b/drivers/staging/r8188eu/core/rtw_xmit.c
> index 98864fc55b25..ea13f11b231b 100644
> --- a/drivers/staging/r8188eu/core/rtw_xmit.c
> +++ b/drivers/staging/r8188eu/core/rtw_xmit.c
> @@ -2289,7 +2289,7 @@ static int rtw_mlcst2unicst(struct adapter *padapter, struct sk_buff *skb)
>   	return true;
>   }
>   
> -int rtw_xmit_entry(struct sk_buff *pkt, struct net_device *pnetdev)
> +netdev_tx_t rtw_xmit_entry(struct sk_buff *pkt, struct net_device *pnetdev)
>   {
>   	struct adapter *padapter = (struct adapter *)rtw_netdev_priv(pnetdev);
>   	struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
> @@ -2323,5 +2323,5 @@ int rtw_xmit_entry(struct sk_buff *pkt, struct net_device *pnetdev)
>   	dev_kfree_skb_any(pkt);
>   
>   exit:
> -	return 0;
> +	return NETDEV_TX_OK;
>   }
> diff --git a/drivers/staging/r8188eu/include/rtw_xmit.h b/drivers/staging/r8188eu/include/rtw_xmit.h
> index 8f54c41ba927..82efcd54af3f 100644
> --- a/drivers/staging/r8188eu/include/rtw_xmit.h
> +++ b/drivers/staging/r8188eu/include/rtw_xmit.h
> @@ -368,6 +368,6 @@ int rtw_ack_tx_wait(struct xmit_priv *pxmitpriv, u32 timeout_ms);
>   void rtw_ack_tx_done(struct xmit_priv *pxmitpriv, int status);
>   
>   void rtw_xmit_complete(struct adapter *padapter, struct xmit_frame *pxframe);
> -int rtw_xmit_entry(struct sk_buff *pkt, struct net_device *pnetdev);
> +netdev_tx_t rtw_xmit_entry(struct sk_buff *pkt, struct net_device *pnetdev);
>   
>   #endif	/* _RTL871X_XMIT_H_ */

Tested-by: Philipp Hortmann <philipp.g.hortmann@...il.com> # Edimax N150