netdev - [PATCH net-next] net/mlx4_core: Handle null return by pci_match

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Date:	Sun, 30 Mar 2014 18:26:55 +0300
From:	Amir Vadai <amirv@...lanox.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, Yevgeny Petrilin <yevgenyp@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Amir Vadai <amirv@...lanox.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Wei Yang <weiyang@...ux.vnet.ibm.com>
Subject: [PATCH net-next] net/mlx4_core: Handle null return by pci_match_id()

Fix issue introduced by commit: 97a5221 "net/mlx4_core: pass
pci_device_id.driver_data to __mlx4_init_one during reset".

pci_match_id() might return NULL if someone binds the driver to a device
manually using /sys/bus/pci/drivers/.../new_id. Need to check 'id'
before using it.

Thanks to Bjorn who raised the problem.

CC: Bjorn Helgaas <bhelgaas@...gle.com>
CC: Wei Yang <weiyang@...ux.vnet.ibm.com>
Signed-off-by: Amir Vadai <amirv@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx4/main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index f0ae95f..a2f6623 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -2759,6 +2759,9 @@ static pci_ers_result_t mlx4_pci_slot_reset(struct pci_dev *pdev)
 	int ret;
 
 	id = pci_match_id(mlx4_pci_table, pdev);
+	if (!id)
+		return PCI_ERS_RESULT_DISCONNECT;
+
 	ret = __mlx4_init_one(pdev, id->driver_data);
 
 	return ret ? PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_RECOVERED;
-- 
1.8.3.4

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