linux-kernel - Re: [PATCH] net: wwan: iosm: Fix return type of ipc_wwan_link

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Message-ID: <CAHNKnsR8jBbJ32mia_XaP3SLWfHNJsFknbrMa9MxZMQbnJ1-pQ@mail.gmail.com>
Date:   Tue, 13 Sep 2022 03:56:37 +0300
From:   Sergey Ryazanov <ryazanov.s.a@...il.com>
To:     Nathan Huckleberry <nhuck@...gle.com>
Cc:     Dan Carpenter <error27@...il.com>, llvm@...ts.linux.dev,
        M Chetan Kumar <m.chetan.kumar@...el.com>,
        Intel Corporation <linuxwwan@...el.com>,
        Loic Poulain <loic.poulain@...aro.org>,
        Johannes Berg <johannes@...solutions.net>,
        "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: wwan: iosm: Fix return type of ipc_wwan_link_transmit

On Tue, Sep 13, 2022 at 12:45 AM Nathan Huckleberry <nhuck@...gle.com> 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 ipc_wwan_link_transmit 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>

Acked-by: Sergey Ryazanov <ryazanov.s.a@...il.com>