linux-kernel - [PATCH] mwifiex: fix unbalanced locking in mwifiex_process_country

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Date:   Mon,  6 Jan 2020 14:42:12 -0800
From:   Brian Norris <briannorris@...omium.org>
To:     linux-wireless@...r.kernel.org
Cc:     <linux-kernel@...r.kernel.org>,
        Ganapathi Bhat <ganapathi.bhat@....com>,
        Nishant Sarmukadam <nishants@...vell.com>,
        Amitkumar Karwar <amitkarwar@...il.com>,
        Xinming Hu <huxinming820@...il.com>,
        Brian Norris <briannorris@...omium.org>,
        stable@...r.kernel.org, huangwen <huangwenabc@...il.com>
Subject: [PATCH] mwifiex: fix unbalanced locking in mwifiex_process_country_ie()

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

diff --git a/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c b/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c
index 6dd835f1efc2..fbfa0b15d0c8 100644
--- a/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c
+++ b/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c
@@ -232,6 +232,7 @@ static int mwifiex_process_country_ie(struct mwifiex_private *priv,
 
 	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;
-- 
2.24.1.735.g03f4e72817-goog