linux-kernel - [PATCH 3.19.y-ckt 069/146] igb: Fix oops on changing number of rings

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Message-Id: <1434579851-1719-70-git-send-email-kamal@canonical.com>
Date:	Wed, 17 Jun 2015 15:22:54 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Toshiaki Makita <makita.toshiaki@....ntt.co.jp>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 069/146] igb: Fix oops on changing number of rings

3.19.8-ckt2 -stable review patch.  If anyone has any objections, please let me know.

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

From: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>

commit c0a06ee185f2b785c7bd44c4fb6fcae80f7d1a54 upstream.

When changing the number of rings by ethtool -L, q_vectors are reused,
which causes oops because of uninitialized pointers.

- When an rx is reused as a tx, q_vector->rx.ring is not set to NULL, which
  misleads igb_poll() to determine that it has an rx ring although it
  actually points to the tx ring.
- When a tx is reused as an rx, q_vector->rx.ring->skb
  (q_vector->ring[0].skb) has a value that was used as tx_stats before.

Fix these problems by zeroing it out on reuseing it.

Fixes: 02ef6e1d0b00 ("igb: Fix queue allocation method to accommodate changing during runtime")
Signed-off-by: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Tested-by: Aaron Brown <aaron.f.brown@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/net/ethernet/intel/igb/igb_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index ff59897..51417a0 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -1207,6 +1207,8 @@ static int igb_alloc_q_vector(struct igb_adapter *adapter,
 	q_vector = adapter->q_vector[v_idx];
 	if (!q_vector)
 		q_vector = kzalloc(size, GFP_KERNEL);
+	else
+		memset(q_vector, 0, size);
 	if (!q_vector)
 		return -ENOMEM;
 
-- 
1.9.1

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