Re: [PATCH] net: wwan: iosm: Fix return type of ipc_wwan_link_transmit

[Sergey Ryazanov]

On Tue, Sep 13, 2022 at 12:45 AM Nathan Huckleberry <nhuck@xxxxxxxxxx> 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@xxxxxxxxx>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1703
> Cc: llvm@xxxxxxxxxxxxxxx
> Signed-off-by: Nathan Huckleberry <nhuck@xxxxxxxxxx>

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