linux-kernel - [PATCH 4.3 069/125] mwifiex: fix NULL pointer dereference during hidden SSID scan

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Date:	Mon,  7 Dec 2015 10:01:22 -0500
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Aniket Nagarnaik <aniketn@...vell.com>,
	Amitkumar Karwar <akarwar@...vell.com>,
	Kalle Valo <kvalo@...eaurora.org>
Subject: [PATCH 4.3 069/125] mwifiex: fix NULL pointer dereference during hidden SSID scan

4.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Aniket Nagarnaik <aniketn@...vell.com>

commit 17e524b1b60f4390d24a51d9524d1648cf5d1447 upstream.

This NULL pointer dereference is observed during suspend resume
stress test. All pending commands are cancelled when system goes
into suspend state. There a corner case in which host may receive
response for last scan command after this and try to trigger extra
active scan for hidden SSIDs.

The issue is fixed by adding a NULL check to skip that extra scan.

Fixes: 2375fa2b36feaf34 (mwifiex: fix unable to connect hidden SSID..)
Signed-off-by: Aniket Nagarnaik <aniketn@...vell.com>
Signed-off-by: Amitkumar Karwar <akarwar@...vell.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/mwifiex/scan.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/wireless/mwifiex/scan.c
+++ b/drivers/net/wireless/mwifiex/scan.c
@@ -1889,7 +1889,7 @@ mwifiex_active_scan_req_for_passive_chan
 	u8 id = 0;
 	struct mwifiex_user_scan_cfg  *user_scan_cfg;
 
-	if (adapter->active_scan_triggered) {
+	if (adapter->active_scan_triggered || !priv->scan_request) {
 		adapter->active_scan_triggered = false;
 		return 0;
 	}


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