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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Wei Yongjun <weiyongjun1@huawei.com>,
        Jia-Ju Bai <baijiaju1990@gmail.com>,
        Kalle Valo <kvalo@codeaurora.org>
Subject: [PATCH 4.19 082/113] cw1200: fix missing unlock on error in cw1200_hw_scan()
Date:   Wed, 15 May 2019 12:56:13 +0200
Message-Id: <20190515090659.848317813@linuxfoundation.org>
In-Reply-To: <20190515090652.640988966@linuxfoundation.org>
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From: Wei Yongjun <weiyongjun1@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 <weiyongjun1@huawei.com>
Acked-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- 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 *
 
 	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);