netdev - RE: [PATCH] netxen: check for root bus in netxen_mask_aer

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Date:	Mon, 17 Sep 2012 12:53:26 -0500
From:	Rajesh Borundia <rajesh.borundia@...gic.com>
To:	"nikolay@...hat.com" <nikolay@...hat.com>,
	Sony Chacko <sony.chacko@...gic.com>
CC:	netdev <netdev@...r.kernel.org>
Subject: RE: [PATCH] netxen: check for root bus in
 netxen_mask_aer_correctable


________________________________________
From: nikolay@...hat.com [nikolay@...hat.com]
Sent: Friday, September 14, 2012 9:20 PM
To: Sony Chacko
Cc: Rajesh Borundia; netdev
Subject: [PATCH] netxen: check for root bus in netxen_mask_aer_correctable

From: Nikolay Aleksandrov <nikolay@...hat.com>

Add a check if pdev->bus->self == NULL (root bus). When attaching
a netxen NIC to a VM it can be on the root bus and the guest would
crash in netxen_mask_aer_correctable() because of a NULL pointer
dereference if CONFIG_PCIEAER is present.

Signed-off-by: Nikolay Aleksandrov <nikolay@...hat.com>
---
 drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c b/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
index 342b3a7..e2a4858 100644
--- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
+++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
@@ -1378,6 +1378,10 @@ static void netxen_mask_aer_correctable(struct netxen_adapter *adapter)
        struct pci_dev *root = pdev->bus->self;
        u32 aer_pos;

+       /* root bus? */
+       if (!root)
+               return;
+
        if (adapter->ahw.board_type != NETXEN_BRDTYPE_P3_4_GB_MM &&
                adapter->ahw.board_type != NETXEN_BRDTYPE_P3_10G_TP)
                return;
--
1.7.11.4


Looks okay.


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