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.
Fixes: cf68fffb66d6 ("add support for Clang CFI")
Signed-off-by: GUO Zihua <guozihua@xxxxxxxxxx>
---
v4:
Added Fixes tag.
v3:
Provide detail on CFI.
v2:
Fix truncated subject.
---
drivers/staging/r8188eu/include/xmit_osdep.h | 2 +-
drivers/staging/r8188eu/os_dep/xmit_linux.c | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/r8188eu/include/xmit_osdep.h b/drivers/staging/r8188eu/include/xmit_osdep.h
index 00658681fef9..947242486144 100644
--- a/drivers/staging/r8188eu/include/xmit_osdep.h
+++ b/drivers/staging/r8188eu/include/xmit_osdep.h
@@ -28,7 +28,7 @@ struct sta_xmit_priv;
struct xmit_frame;
struct xmit_buf;
-int rtw_xmit_entry(struct sk_buff *pkt, struct net_device *pnetdev);
+netdev_tx_t rtw_xmit_entry(struct sk_buff *pkt, struct net_device *pnetdev);
void rtw_os_xmit_schedule(struct adapter *padapter);
diff --git a/drivers/staging/r8188eu/os_dep/xmit_linux.c b/drivers/staging/r8188eu/os_dep/xmit_linux.c
index 91a1e4e3219a..0b04010d6d82 100644
--- a/drivers/staging/r8188eu/os_dep/xmit_linux.c
+++ b/drivers/staging/r8188eu/os_dep/xmit_linux.c
@@ -198,7 +198,7 @@ static int rtw_mlcst2unicst(struct adapter *padapter, struct sk_buff *skb)
return true;
}
-int rtw_xmit_entry(struct sk_buff *pkt, struct net_device *pnetdev)
+netdev_tx_t rtw_xmit_entry(struct sk_buff *pkt, struct net_device *pnetdev)
{
struct adapter *padapter = (struct adapter *)rtw_netdev_priv(pnetdev);
struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
@@ -233,5 +233,5 @@ int rtw_xmit_entry(struct sk_buff *pkt, struct net_device *pnetdev)
exit:
- return 0;
+ return NETDEV_TX_OK;
}
--
2.17.1
