linux-kernel - Re: [PATCH] staging: rtl8192e: Fix return type for implementation of ndo_start

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Date:   Fri, 9 Sep 2022 09:56:59 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Philipp Hortmann <philipp.g.hortmann@...il.com>
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Dan Carpenter <error27@...il.com>
Subject: Re: [PATCH] staging: rtl8192e: Fix return type for implementation of
 ndo_start_xmit

On Thu, Sep 08, 2022 at 10:32:43PM +0200, Philipp Hortmann wrote:
> CFI (Control Flow Integrity) is a safety feature allowing the system to
> detect and react should a potential control flow hijacking occurs. In
> particular, the Forward-Edge CFI protects indirect function calls by
> ensuring the prototype of function that is actually called matches the
> definition of the function hook.
> 
> Since Linux now supports CFI, it will be a good idea to fix mismatched
> return type for implementation of hooks. Otherwise this would get
> cought out by CFI and cause a panic.
> 
> Use enums from netdev_tx_t as return value instead, then change return
> type to netdev_tx_t.
> 
> Suggested-by: Dan Carpenter <error27@...il.com>
> Signed-off-by: Philipp Hortmann <philipp.g.hortmann@...il.com>
> ---
> Tested with rtl8192e
> Transferred this patch over wlan connection of rtl8192e
> ---
>  drivers/staging/rtl8192e/rtllib.h    |  2 +-
>  drivers/staging/rtl8192e/rtllib_tx.c | 10 +++++-----
>  2 files changed, 6 insertions(+), 6 deletions(-)

Someone sent the same patch before you did:
	https://lore.kernel.org/r/20220905130053.10731-1-guozihua@huawei.com