linux-kernel - [PATCH 3.10 223/250] Staging: vt6655-6: potential NULL dereference in hostap_disable

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Date:   Thu,  8 Jun 2017 01:00:09 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 223/250] Staging: vt6655-6: potential NULL dereference in hostap_disable_hostapd()

From: Dan Carpenter <dan.carpenter@...cle.com>

commit cb4855b49deb1acce27706ad9509d63c4fe8e988 upstream.

We fixed this to use free_netdev() instead of kfree() but unfortunately
free_netdev() doesn't accept NULL pointers.  Smatch complains about
this, it's not something I discovered through testing.

Fixes: 3030d40b5036 ('staging: vt6655: use free_netdev instead of kfree')
Fixes: 0a438d5b381e ('staging: vt6656: use free_netdev instead of kfree')
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[wt: only vt6656 was converted to free_netdev in 3.10]
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/staging/vt6656/hostap.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/vt6656/hostap.c b/drivers/staging/vt6656/hostap.c
index c699a30..cfffdd2 100644
--- a/drivers/staging/vt6656/hostap.c
+++ b/drivers/staging/vt6656/hostap.c
@@ -133,7 +133,8 @@ static int hostap_disable_hostapd(struct vnt_private *pDevice, int rtnl_locked)
             DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO "%s: Netdevice %s unregistered\n",
 		       pDevice->dev->name, pDevice->apdev->name);
 	}
-	free_netdev(pDevice->apdev);
+	if (pDevice->apdev)
+		free_netdev(pDevice->apdev);
 	pDevice->apdev = NULL;
     pDevice->bEnable8021x = false;
     pDevice->bEnableHostWEP = false;
-- 
2.8.0.rc2.1.gbe9624a