[PATCH AUTOSEL 5.4 14/29] net: davicom: Fix return type of dm9000_start_xmit

From: Sasha Levin
Date: Sun Oct 09 2022 - 19:17:02 EST


From: Nathan Huckleberry <nhuck@xxxxxxxxxx>

[ Upstream commit 0191580b000d50089a0b351f7cdbec4866e3d0d2 ]

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 dm9000_start_xmit 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>
Reviewed-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220912194722.809525-1-nhuck@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/ethernet/davicom/dm9000.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/davicom/dm9000.c b/drivers/net/ethernet/davicom/dm9000.c
index 1d5d8984b49a..2dcf85ae5eb3 100644
--- a/drivers/net/ethernet/davicom/dm9000.c
+++ b/drivers/net/ethernet/davicom/dm9000.c
@@ -1017,7 +1017,7 @@ static void dm9000_send_packet(struct net_device *dev,
* Hardware start transmission.
* Send a packet to media from the upper layer.
*/
-static int
+static netdev_tx_t
dm9000_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
unsigned long flags;
--
2.35.1