netdev - [PATCH AUTOSEL 5.19 47/73] net: wwan: iosm: Fix return type of ipc_wwan_link

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Date:   Sun,  9 Oct 2022 18:14:25 -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,
        Sergey Ryazanov <ryazanov.s.a@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>, m.chetan.kumar@...el.com,
        linuxwwan@...el.com, loic.poulain@...aro.org, davem@...emloft.net,
        edumazet@...gle.com, pabeni@...hat.com, nathan@...nel.org,
        ndesaulniers@...gle.com, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.19 47/73] net: wwan: iosm: Fix return type of ipc_wwan_link_transmit

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

[ 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@...il.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/1703
Cc: llvm@...ts.linux.dev
Signed-off-by: Nathan Huckleberry <nhuck@...gle.com>
Acked-by: Sergey Ryazanov <ryazanov.s.a@...il.com>
Link: https://lore.kernel.org/r/20220912214455.929028-1-nhuck@google.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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