From fd0e435b0fe85622f167b84432552885a4856ac8 Mon Sep 17 00:00:00 2001 From: Phil Oester Date: Mon, 14 Mar 2011 06:22:04 +0000 Subject: [PATCH] bonding: Incorrect TX queue offset Git-commit: fd0e435b0fe85622f167b84432552885a4856ac8 Patch-mainline: v2.6.39-rc1~468^2~15 Reference: bnc#687116, CVE-2011-1581 When packets come in from a device with >= 16 receive queues headed out a bonding interface, syslog gets filled with this: kernel: bond0 selects TX queue 16, but real number of TX queues is 16 because queue_mapping is offset by 1. Adjust return value to account for the offset. This is a revision of my earlier patch (which did not use the skb_rx_queue_* helpers - thanks to Ben for the suggestion). Andy submitted a similar patch which emits a pr_warning on invalid queue selection, but I believe the log spew is not useful. We can revisit that question in the future, but in the interim I believe fixing the core problem is worthwhile. Signed-off-by: Phil Oester Signed-off-by: Andy Gospodarek Signed-off-by: David S. Miller Signed-off-by: Brandon Philips --- drivers/net/bonding/bond_main.c | 11 +++++++++-- 1 files changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 3ad4f50..a93d941 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -4341,11 +4341,18 @@ static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb) { /* * This helper function exists to help dev_pick_tx get the correct - * destination queue. Using a helper function skips the a call to + * destination queue. Using a helper function skips a call to * skb_tx_hash and will put the skbs in the queue we expect on their * way down to the bonding driver. */ - return skb->queue_mapping; + u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; + + if (unlikely(txq >= dev->real_num_tx_queues)) { + do + txq -= dev->real_num_tx_queues; + while (txq >= dev->real_num_tx_queues); + } + return txq; } static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) -- 1.7.3.4