linux-kernel - [PATCH 3.16.y-ckt 113/126] bonding: fix panic on non-ARPHRD

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Date:	Wed,  9 Dec 2015 09:38:03 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
	Jay Vosburgh <jay.vosburgh@...onical.com>,
	"David S. Miller" <davem@...emloft.net>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 113/126] bonding: fix panic on non-ARPHRD_ETHER enslave failure

3.16.7-ckt21 -stable review patch.  If anyone has any objections, please let me know.

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

From: Jay Vosburgh <jay.vosburgh@...onical.com>

commit 40baec225765c54eefa870530dd613bad9829bb7 upstream.

Since commit 7d5cd2ce529b, when bond_enslave fails on devices that
are not ARPHRD_ETHER, if needed, it resets the bonding device back to
ARPHRD_ETHER by calling ether_setup.

	Unfortunately, ether_setup clobbers dev->flags, clearing IFF_UP
if the bond device is up, leaving it in a quasi-down state without
having actually gone through dev_close.  For bonding, if any periodic
work queue items are active (miimon, arp_interval, etc), those will
remain running, as they are stopped by bond_close.  At this point, if
the bonding module is unloaded or the bond is deleted, the system will
panic when the work function is called.

	This panic is resolved by calling dev_close on the bond itself
prior to calling ether_setup.

Cc: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Signed-off-by: Jay Vosburgh <jay.vosburgh@...onical.com>
Fixes: 7d5cd2ce5292 ("bonding: correctly handle bonding type change on enslave failure")
Acked-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/net/bonding/bond_main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index ddb2e2564470..8fe94f711f39 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1667,6 +1667,7 @@ err_undo_flags:
 					    slave_dev->dev_addr))
 			eth_hw_addr_random(bond_dev);
 		if (bond_dev->type != ARPHRD_ETHER) {
+			dev_close(bond_dev);
 			ether_setup(bond_dev);
 			bond_dev->flags |= IFF_MASTER;
 			bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
--
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