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From: Nathan Huckleberry <nhuck@google.com>
To: unlisted-recipients:; (no To-header on input)
Cc: Nathan Huckleberry <nhuck@google.com>,
	Dan Carpenter <error27@gmail.com>,
	llvm@lists.linux.dev, "David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Tom Rix <trix@redhat.com>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] net: davicom: Fix return type of dm9000_start_xmit
Date: Mon, 12 Sep 2022 12:47:19 -0700	[thread overview]
Message-ID: <20220912194722.809525-1-nhuck@google.com> (raw)

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>
---
 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;
-- 
2.37.2.789.g6183377224-goog


WARNING: multiple messages have this Message-ID (diff)
From: Nathan Huckleberry <nhuck@google.com>
Cc: Nathan Huckleberry <nhuck@google.com>,
	Dan Carpenter <error27@gmail.com>,
	llvm@lists.linux.dev,  "David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	 Jakub Kicinski <kuba@kernel.org>,
	Paolo Abeni <pabeni@redhat.com>,
	 Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Tom Rix <trix@redhat.com>,
	 netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] net: davicom: Fix return type of dm9000_start_xmit
Date: Mon, 12 Sep 2022 12:47:19 -0700	[thread overview]
Message-ID: <20220912194722.809525-1-nhuck@google.com> (raw)

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>
---
 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;
-- 
2.37.2.789.g6183377224-goog


             reply	other threads:[~2022-09-12 19:48 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-12 19:47 Nathan Huckleberry [this message]
2022-09-12 19:47 ` [PATCH] net: davicom: Fix return type of dm9000_start_xmit Nathan Huckleberry
2022-09-13 22:29 ` Nathan Chancellor
2022-09-20  1:40 ` patchwork-bot+netdevbpf
2022-09-20  1:40   ` patchwork-bot+netdevbpf

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