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staging: rtl8192e: Fix return type for implementation of ndo_start_xmit

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CFI (Control Flow Integrity) is a safety feature allowing the system to
detect and react should a potential control flow hijacking occurs. In
particular, the Forward-Edge CFI protects indirect function calls by
ensuring the prototype of function that is actually called matches the
definition of the function hook.

Since Linux now supports CFI, it will be a good idea to fix mismatched
return type for implementation of hooks. Otherwise this would get
cought out by CFI and cause a panic.

Use enums from netdev_tx_t as return value instead, then change return
type to netdev_tx_t. Note that rtllib_xmit_inter() would return 1 only
on allocation failure and the queue is stopped if that happens, meeting
the documented requirement if NETDEV_TX_BUSY should be returned by
ndo_start_xmit.

Signed-off-by: GUO Zihua <guozihua@huawei.com>
Link: https://lore.kernel.org/r/20220905130053.10731-1-guozihua@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
GUO Zihua 2022-09-05 21:00:53 +08:00 committed by Greg Kroah-Hartman
parent 307d343620
commit 513d9a6115
2 changed files with 3 additions and 3 deletions
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2
drivers/staging/rtl8192e/rtllib.h
View File

@ -1938,7 +1938,7 @@ int rtllib_encrypt_fragment(
struct sk_buff *frag,
int hdr_len);
int rtllib_xmit(struct sk_buff *skb, struct net_device *dev);
netdev_tx_t rtllib_xmit(struct sk_buff *skb, struct net_device *dev);
void rtllib_txb_free(struct rtllib_txb *txb);
/* rtllib_rx.c */

4
drivers/staging/rtl8192e/rtllib_tx.c
View File

@ -962,9 +962,9 @@ 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);
return rtllib_xmit_inter(skb, dev) ? NETDEV_TX_BUSY : NETDEV_TX_OK;
}
EXPORT_SYMBOL(rtllib_xmit);