From: Nathan Huckleberry nhuck@google.com
[ 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@gmail.com Link: https://github.com/ClangBuiltLinux/linux/issues/1703 Cc: llvm@lists.linux.dev Signed-off-by: Nathan Huckleberry nhuck@google.com Reviewed-by: Nathan Chancellor nathan@kernel.org Link: https://lore.kernel.org/r/20220912194722.809525-1-nhuck@google.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 0985ab216566..186a5e0a7862 100644 --- a/drivers/net/ethernet/davicom/dm9000.c +++ b/drivers/net/ethernet/davicom/dm9000.c @@ -1012,7 +1012,7 @@ 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;