[PATCH AUTOSEL 4.19 14/19] staging: rtl8192u: Fix return type of ieee80211_xmit

Sasha Levin
2022-10-13T00:57:32Z

From: Nathan Huckleberry <nhuck@google.com>

[ Upstream commit 2851349ac351010a2649e0ff86a1e3d68fe5d683 ]

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 ieee80211_xmit 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>
Signed-off-by: Nathan Huckleberry <nhuck@google.com>
Link: https://lore.kernel.org/r/20220914210750.423048-1-nhuck@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/staging/rtl8192u/ieee80211/ieee80211.h | 2 +-
drivers/staging/rtl8192u/ieee80211/ieee80211_tx.c | 6 +++---
2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211.h b/drivers/staging/rtl8192u/ieee80211/ieee80211.h
index 3cfeac0d7214..404ec615b74b 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211.h
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211.h
@@ -2183,7 +2183,7 @@ int ieee80211_set_encryption(struct ieee80211_device *ieee);
int ieee80211_encrypt_fragment(struct ieee80211_device *ieee,
struct sk_buff *frag, int hdr_len);

-int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev);
+netdev_tx_t ieee80211_xmit(struct sk_buff *skb, struct net_device *dev);
void ieee80211_txb_free(struct ieee80211_txb *txb);

diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_tx.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_tx.c
index cc4049de975d..29fffd9073ec 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_tx.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_tx.c
@@ -593,7 +593,7 @@ static void ieee80211_query_seqnum(struct ieee80211_device *ieee,
}
}

-int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
+netdev_tx_t ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ieee80211_device *ieee = netdev_priv(dev);
struct ieee80211_txb *txb = NULL;
@@ -901,13 +901,13 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
if ((*ieee->hard_start_xmit)(txb, dev) == 0) {
stats->tx_packets++;
stats->tx_bytes += __le16_to_cpu(txb->payload_size);
- return 0;
+ return NETDEV_TX_OK;
}
ieee80211_txb_free(txb);
}
}

- return 0;
+ return NETDEV_TX_OK;

failed:
spin_unlock_irqrestore(&ieee->lock, flags);
--
2.35.1