Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Nathan Huckleberry <nhuck@google.com>,
        Dan Carpenter <error27@gmail.com>, llvm@lists.linux.dev,
        Nathan Chancellor <nathan@kernel.org>,
        Jakub Kicinski <kuba@kernel.org>,
        Sasha Levin <sashal@kernel.org>, davem@davemloft.net,
        edumazet@google.com, pabeni@redhat.com, ndesaulniers@google.com,
        petrm@nvidia.com, thomas.lendacky@amd.com, geoff@infradead.org,
        mw@semihalf.com, wsa+renesas@sang-engineering.com,
        dmitry.torokhov@gmail.com, netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 6.0 46/77] net: davicom: Fix return type of dm9000_start_xmit
Date:   Sun,  9 Oct 2022 18:07:23 -0400
Message-Id: <20221009220754.1214186-46-sashal@kernel.org>
In-Reply-To: <20221009220754.1214186-1-sashal@kernel.org>
References: <20221009220754.1214186-1-sashal@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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;
-- 
2.35.1