[PATCH 4.4 175/266] cw1200: fix missing unlock on error in cw1200_hw_scan()

[Greg Kroah-Hartman]

From: Wei Yongjun <weiyongj...@huawei.com>

commit 51c8d24101c79ffce3e79137e2cee5dfeb956dd7 upstream.

Add the missing unlock before return from function cw1200_hw_scan()
in the error handling case.

Fixes: 4f68ef64cd7f ("cw1200: Fix concurrency use-after-free bugs in 
cw1200_hw_scan()")
Signed-off-by: Wei Yongjun <weiyongj...@huawei.com>
Acked-by: Jia-Ju Bai <baijiaju1...@gmail.com>
Signed-off-by: Kalle Valo <kv...@codeaurora.org>
[iwamatsu: Change the patching file from drivers/net/wireless/st/cw1200/scan.c 
to
drivers/net/wireless/cw1200/scan.c]
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwama...@toshiba.co.jp>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/net/wireless/cw1200/scan.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/net/wireless/cw1200/scan.c
+++ b/drivers/net/wireless/cw1200/scan.c
@@ -84,8 +84,11 @@ int cw1200_hw_scan(struct ieee80211_hw *
 
        frame.skb = ieee80211_probereq_get(hw, priv->vif->addr, NULL, 0,
                req->ie_len);
-       if (!frame.skb)
+       if (!frame.skb) {
+               mutex_unlock(&priv->conf_mutex);
+               up(&priv->scan.lock);
                return -ENOMEM;
+       }
 
        if (req->ie_len)
                memcpy(skb_put(frame.skb, req->ie_len), req->ie, req->ie_len);