4.9-stable review patch. If anyone has any objections, please let me know.
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From: Limin Zhu liminzhu@marvell.com
[ Upstream commit c61cfe49f0f0f0d1f8b56d0b045838d597e8c3a3 ]
(1) Change virtual interface operation in cfg80211 process reset and reinitilize private data structure. (2) Scan result event processed in main process will dereference private data structure concurrently, ocassionly crash the kernel.
The cornel case could be trigger by below steps: (1) wpa_cli mlan0 scan (2) ./hostapd mlan0.conf
Cfg80211 asynchronous scan procedure is not all the time operated under rtnl lock, here we add the protect to serialize the cfg80211 scan and change_virtual interface operation.
Signed-off-by: Limin Zhu liminzhu@marvell.com Signed-off-by: Xinming Hu huxm@marvell.com Signed-off-by: Kalle Valo kvalo@codeaurora.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/wireless/marvell/mwifiex/cfg80211.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/net/wireless/marvell/mwifiex/cfg80211.c +++ b/drivers/net/wireless/marvell/mwifiex/cfg80211.c @@ -1109,6 +1109,12 @@ mwifiex_cfg80211_change_virtual_intf(str struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev); enum nl80211_iftype curr_iftype = dev->ieee80211_ptr->iftype;
+ if (priv->scan_request) { + mwifiex_dbg(priv->adapter, ERROR, + "change virtual interface: scan in process\n"); + return -EBUSY; + } + switch (curr_iftype) { case NL80211_IFTYPE_ADHOC: switch (type) {