[PATCH] net: lan966x: Fix return type of lan966x_port_xmit

Nathan Huckleberry
2022-09-29T18:27:50Z

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 lan966x_port_xmit should be changed from int to
netdev_tx_t.

Reported-by: Dan Carpenter <error27@gmail.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/1703
Cc: llvm@lists.linux.dev
Signed-off-by: Nathan Huckleberry <nhuck@google.com>
---
drivers/net/ethernet/microchip/lan966x/lan966x_main.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
index b98d37c76edb..be2fd030cccb 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
@@ -344,7 +344,8 @@ static void lan966x_ifh_set_timestamp(void *ifh, u64 timestamp)
IFH_POS_TIMESTAMP, IFH_LEN * 4, PACK, 0);
}

-static int lan966x_port_xmit(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t lan966x_port_xmit(struct sk_buff *skb,
+ struct net_device *dev)
{
struct lan966x_port *port = netdev_priv(dev);
struct lan966x *lan966x = port->lan966x;
--
2.38.0.rc1.362.ged0d419d3c-goog