linux-kernel - [PATCH] net: ax88796c: Fix return type of ax88796c_start

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Date:   Mon, 12 Sep 2022 12:40:30 -0700
From:   Nathan Huckleberry <nhuck@...gle.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Nathan Huckleberry <nhuck@...gle.com>,
        Dan Carpenter <error27@...il.com>, llvm@...ts.linux.dev,
        "Łukasz Stelmach" <l.stelmach@...sung.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: ax88796c: Fix return type of ax88796c_start_xmit

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 ax88796c_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>
---
 drivers/net/ethernet/asix/ax88796c_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/asix/ax88796c_main.c b/drivers/net/ethernet/asix/ax88796c_main.c
index 6ba5b024a7be..f1d610efd69e 100644
--- a/drivers/net/ethernet/asix/ax88796c_main.c
+++ b/drivers/net/ethernet/asix/ax88796c_main.c
@@ -381,7 +381,7 @@ static int ax88796c_hard_xmit(struct ax88796c_device *ax_local)
 	return 1;
 }
 
-static int
+static netdev_tx_t
 ax88796c_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 {
 	struct ax88796c_device *ax_local = to_ax88796c_device(ndev);
-- 
2.37.2.789.g6183377224-goog