linux-kernel - [PATCH 4.4 33/91] mwifiex: fix unbalanced locking in mwifiex_process_country

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Message-Id: <20200213151834.516337372@linuxfoundation.org>
Date:   Thu, 13 Feb 2020 07:19:50 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, huangwen <huangwenabc@...il.com>,
        Ganapathi Bhat <ganapathi.bhat@....com>,
        Brian Norris <briannorris@...omium.org>,
        Kalle Valo <kvalo@...eaurora.org>
Subject: [PATCH 4.4 33/91] mwifiex: fix unbalanced locking in mwifiex_process_country_ie()

From: Brian Norris <briannorris@...omium.org>

commit 65b1aae0d9d5962faccc06bdb8e91a2a0b09451c upstream.

We called rcu_read_lock(), so we need to call rcu_read_unlock() before
we return.

Fixes: 3d94a4a8373b ("mwifiex: fix possible heap overflow in mwifiex_process_country_ie()")
Cc: stable@...r.kernel.org
Cc: huangwen <huangwenabc@...il.com>
Cc: Ganapathi Bhat <ganapathi.bhat@....com>
Signed-off-by: Brian Norris <briannorris@...omium.org>
Acked-by: Ganapathi Bhat <ganapathi.bhat@....com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/mwifiex/sta_ioctl.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/wireless/mwifiex/sta_ioctl.c
+++ b/drivers/net/wireless/mwifiex/sta_ioctl.c
@@ -232,6 +232,7 @@ static int mwifiex_process_country_ie(st
 
 	if (country_ie_len >
 	    (IEEE80211_COUNTRY_STRING_LEN + MWIFIEX_MAX_TRIPLET_802_11D)) {
+		rcu_read_unlock();
 		mwifiex_dbg(priv->adapter, ERROR,
 			    "11D: country_ie_len overflow!, deauth AP\n");
 		return -EINVAL;