linux-kernel - [PATCH] Staging: rtl8192e: Fix return type of rtllib

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Date:   Mon, 12 Sep 2022 14:45:44 -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,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Felix Schlepper <f3sch.git@...look.com>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH] Staging: rtl8192e: Fix return type of rtllib_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 rtllib_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/staging/rtl8192e/rtllib_tx.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/rtl8192e/rtllib_tx.c b/drivers/staging/rtl8192e/rtllib_tx.c
index 42f81b23a144..1b665afd309e 100644
--- a/drivers/staging/rtl8192e/rtllib_tx.c
+++ b/drivers/staging/rtl8192e/rtllib_tx.c
@@ -543,7 +543,7 @@ static u8 rtllib_current_rate(struct rtllib_device *ieee)
 		return ieee->rate & 0x7F;
 }
 
-static int rtllib_xmit_inter(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t rtllib_xmit_inter(struct sk_buff *skb, struct net_device *dev)
 {
 	struct rtllib_device *ieee = (struct rtllib_device *)
 				     netdev_priv_rsl(dev);
@@ -946,13 +946,13 @@ static int rtllib_xmit_inter(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;
 			}
 			rtllib_txb_free(txb);
 		}
 	}
 
-	return 0;
+	return NETDEV_TX_OK;
 
  failed:
 	spin_unlock_irqrestore(&ieee->lock, flags);
@@ -962,7 +962,7 @@ static int rtllib_xmit_inter(struct sk_buff *skb, struct net_device *dev)
 
 }
 
-int rtllib_xmit(struct sk_buff *skb, struct net_device *dev)
+netdev_tx_t rtllib_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	memset(skb->cb, 0, sizeof(skb->cb));
 	return rtllib_xmit_inter(skb, dev);
-- 
2.37.2.789.g6183377224-goog