From: Nathan Huckleberry nhuck@google.com
[ Upstream commit b77599043f00fce9253d0f22522c5d5b521555ce ]
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 cvm_oct_xmit and cvm_oct_xmit_pow should be changed from int to netdev_tx_t.
Link: https://github.com/ClangBuiltLinux/linux/issues/1703 Cc: llvm@lists.linux.dev Reported-by: Dan Carpenter error27@gmail.com Reviewed-by: Nathan Chancellor nathan@kernel.org Acked-by: Arnd Bergmann arnd@arndb.de Signed-off-by: Nathan Huckleberry nhuck@google.com Link: https://lore.kernel.org/r/20220914211057.423617-1-nhuck@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/staging/octeon/ethernet-tx.c | 4 ++-- drivers/staging/octeon/ethernet-tx.h | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/staging/octeon/ethernet-tx.c b/drivers/staging/octeon/ethernet-tx.c index 31f35025d19e..19c5c27a3ead 100644 --- a/drivers/staging/octeon/ethernet-tx.c +++ b/drivers/staging/octeon/ethernet-tx.c @@ -138,7 +138,7 @@ static void cvm_oct_free_tx_skbs(struct net_device *dev) * * Returns Always returns NETDEV_TX_OK */ -int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev) +netdev_tx_t cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev) { cvmx_pko_command_word0_t pko_command; union cvmx_buf_ptr hw_buffer; @@ -521,7 +521,7 @@ int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
* Returns Always returns zero */ -int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev) +netdev_tx_t cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev) { struct octeon_ethernet *priv = netdev_priv(dev); void *packet_buffer; diff --git a/drivers/staging/octeon/ethernet-tx.h b/drivers/staging/octeon/ethernet-tx.h index 84848e4c1664..65faefc87081 100644 --- a/drivers/staging/octeon/ethernet-tx.h +++ b/drivers/staging/octeon/ethernet-tx.h @@ -8,8 +8,8 @@ * published by the Free Software Foundation. */
-int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev); -int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev); +netdev_tx_t cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev); +netdev_tx_t cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev); int cvm_oct_transmit_qos(struct net_device *dev, void *work_queue_entry, int do_free, int qos); void cvm_oct_tx_initialize(void);