linux-kernel - [PATCH AUTOSEL 5.15 27/46] net: ethernet: litex: Fix return type of liteeth_start

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Date:   Sun,  9 Oct 2022 18:18:52 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Nathan Huckleberry <nhuck@...gle.com>,
        Dan Carpenter <error27@...il.com>, llvm@...ts.linux.dev,
        Nathan Chancellor <nathan@...nel.org>,
        Gabriel Somlo <gsomlo@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>, davem@...emloft.net,
        edumazet@...gle.com, pabeni@...hat.com, kgugala@...micro.com,
        mholenko@...micro.com, joel@....id.au, ndesaulniers@...gle.com,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 27/46] net: ethernet: litex: Fix return type of liteeth_start_xmit

From: Nathan Huckleberry <nhuck@...gle.com>

[ Upstream commit 40662333dd7c64664247a6138bc33f3974e3a331 ]

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 liteeth_start_xmit should be changed from int to
netdev_tx_t.

Reported-by: Dan Carpenter <error27@...il.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/1703
Cc: llvm@...ts.linux.dev
Signed-off-by: Nathan Huckleberry <nhuck@...gle.com>
Reviewed-by: Nathan Chancellor <nathan@...nel.org>
Acked-by: Gabriel Somlo <gsomlo@...il.com>
Link: https://lore.kernel.org/r/20220912195307.812229-1-nhuck@google.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/litex/litex_liteeth.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/litex/litex_liteeth.c b/drivers/net/ethernet/litex/litex_liteeth.c
index 5bb1cc8a2ce1..0aa855f838f2 100644
--- a/drivers/net/ethernet/litex/litex_liteeth.c
+++ b/drivers/net/ethernet/litex/litex_liteeth.c
@@ -152,7 +152,8 @@ static int liteeth_stop(struct net_device *netdev)
 	return 0;
 }
 
-static int liteeth_start_xmit(struct sk_buff *skb, struct net_device *netdev)
+static netdev_tx_t liteeth_start_xmit(struct sk_buff *skb,
+				      struct net_device *netdev)
 {
 	struct liteeth *priv = netdev_priv(netdev);
 	void __iomem *txbuffer;
-- 
2.35.1