[PATCH net-next] cw1200: fix missing unlock on error in cw1200_hw_scan()

[Wei Yongjun]

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

diff --git a/drivers/net/wireless/st/cw1200/scan.c 
b/drivers/net/wireless/st/cw1200/scan.c
index 0a9eac9..71e9b91 100644
--- a/drivers/net/wireless/st/cw1200/scan.c
+++ b/drivers/net/wireless/st/cw1200/scan.c
@@ -84,8 +84,11 @@ int cw1200_hw_scan(struct ieee80211_hw *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)
                skb_put_data(frame.skb, req->ie, req->ie_len);