From: Nathan Huckleberry <nhuck@xxxxxxxxxx> [ Upstream commit 0c9441c430104dcf2cd066aae74dbeefb9f9e1bf ] 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> Link: https://lore.kernel.org/r/20220912214455.929028-1-nhuck@xxxxxxxxxx Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/net/wwan/iosm/iosm_ipc_wwan.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/wwan/iosm/iosm_ipc_wwan.c b/drivers/net/wwan/iosm/iosm_ipc_wwan.c index 27151148c782..03757ad21d51 100644 --- a/drivers/net/wwan/iosm/iosm_ipc_wwan.c +++ b/drivers/net/wwan/iosm/iosm_ipc_wwan.c @@ -103,8 +103,8 @@ static int ipc_wwan_link_stop(struct net_device *netdev) } /* Transmit a packet */ -static int ipc_wwan_link_transmit(struct sk_buff *skb, - struct net_device *netdev) +static netdev_tx_t ipc_wwan_link_transmit(struct sk_buff *skb, + struct net_device *netdev) { struct iosm_netdev_priv *priv = wwan_netdev_drvpriv(netdev); struct iosm_wwan *ipc_wwan = priv->ipc_wwan; -- 2.35.1
