linux-kernel - [PATCH 3.14 71/73] batman: fix a bogus warning from batadv_is_on_batman

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Message-Id: <20141205224436.061307958@linuxfoundation.org>
Date:	Fri,  5 Dec 2014 14:45:17 -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, Jet Chen <jet.chen@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	Antonio Quartulli <antonio@...n-mesh.com>,
	Marek Lindner <mareklindner@...mailbox.ch>,
	Cong Wang <xiyou.wangcong@...il.com>,
	Cong Wang <cwang@...pensource.com>
Subject: [PATCH 3.14 71/73] batman: fix a bogus warning from batadv_is_on_batman_iface()

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

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

From: Cong Wang <cwang@...pensource.com>

commit b6ed5498601df40489606dbc14a9c7011c16630b upstream.

batman tries to search dev->iflink to check if it's a batman interface,
but ->iflink could be 0, which is not a valid ifindex. It should just
avoid iflink == 0 case.

Reported-by: Jet Chen <jet.chen@...el.com>
Tested-by: Jet Chen <jet.chen@...el.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: Steffen Klassert <steffen.klassert@...unet.com>
Cc: Antonio Quartulli <antonio@...n-mesh.com>
Cc: Marek Lindner <mareklindner@...mailbox.ch>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
Signed-off-by: Cong Wang <cwang@...pensource.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/batman-adv/hard-interface.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -83,7 +83,7 @@ static bool batadv_is_on_batman_iface(co
 		return true;

 	/* no more parents..stop recursion */
-	if (net_dev->iflink == net_dev->ifindex)
+	if (net_dev->iflink == 0 || net_dev->iflink == net_dev->ifindex)
 		return false;

 	/* recurse over the parent device */

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