[PATCH] fix infoleak in ioctl_cfg80211

[Kangjie Lu]

"mac" is an array allocated in stack without being initialized,
and will be sent out via "nla_put". The dump_station() is supposed
to initialize the mac address; otherwise, sensitive data in kernel
stack will be leaked. To fix this, either initialize it (e.g.,
memset) or completely remove this dump_station().

Signed-off-by: Kangjie Lu <kjlu@xxxxxxxxxx>
---
 drivers/staging/rtl8723au/os_dep/ioctl_cfg80211.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/rtl8723au/os_dep/ioctl_cfg80211.c b/drivers/staging/rtl8723au/os_dep/ioctl_cfg80211.c
index 12d1844..44a1582 100644
--- a/drivers/staging/rtl8723au/os_dep/ioctl_cfg80211.c
+++ b/drivers/staging/rtl8723au/os_dep/ioctl_cfg80211.c
@@ -2926,6 +2926,7 @@ static int cfg80211_rtw_dump_station(struct wiphy *wiphy,
 
 	/* TODO: dump scanned queue */
 
+	memset(mac, 0, ETH_ALEN);
 	return -ENOENT;
 }
 
-- 
1.9.1