linux-kernel - Re: [PATCH AUTOSEL 4.9 11/16] net: korina: Fix return type of korina_send

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Message-ID: <20221017125004.GC13227@duo.ucw.cz>
Date:   Mon, 17 Oct 2022 14:50:04 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Pavel Machek <pavel@...x.de>
Cc:     Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Nathan Huckleberry <nhuck@...gle.com>,
        Dan Carpenter <error27@...il.com>, llvm@...ts.linux.dev,
        Nathan Chancellor <nathan@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>, davem@...emloft.net,
        edumazet@...gle.com, pabeni@...hat.com, ndesaulniers@...gle.com,
        mkl@...gutronix.de, thomas.lendacky@....com, khalasa@...p.pl,
        wsa+renesas@...g-engineering.com, netdev@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 4.9 11/16] net: korina: Fix return type of
 korina_send_packet

Hi!

> > From: Nathan Huckleberry <nhuck@...gle.com>
> > 
> > [ Upstream commit 106c67ce46f3c82dd276e983668a91d6ed631173 ]
> > 
> > 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 korina_send_packet should be changed from int to
> > netdev_tx_t.
> 
> Patches 4-6, 9-11: I see this is nice cleanup for mainline, but ... do
> we have CFI in 4.9 tree? This mismatch does not and can not cause any
> problems there, right?

Quoting Greg on very similar patch:

#kCFI showed up in 6.1, so this is not needed in any stable branches,
#please drop it from all.

#thanks,

#greg k-h

Best regards,
								Pavel

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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