netdev - [PATCH net v3 1/4] e1000e: Fix a null deference in e1000

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Date:	Thu, 25 Dec 2014 09:57:00 +0800
From:	Jia-Ju Bai <baijiaju1990@....com>
To:	jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com,
	bruce.w.allan@...el.com, carolyn.wyborny@...el.com,
	donald.c.skidmore@...el.com, gregory.v.rose@...el.com,
	matthew.vick@...el.com, john.ronciak@...el.com,
	mitch.a.williams@...el.com
Cc:	linux.nics@...el.com, e1000-devel@...ts.sourceforge.net,
	netdev@...r.kernel.org, Jia-Ju Bai <baijiaju1990@....com>
Subject: [PATCH net v3 1/4] e1000e: Fix a null deference in e1000_open

The function vzalloc is called by e1000e_setup_rx_resources (in
e1000_open) when initializing the ethernet card driver. But when vzalloc is
failed, "err" segment in e1000e_setup_rx_resources is executed to return,
and then e1000e_free_tx_resources in "err_setup_rx" segment is executed to 
halt e1000_open. However, "writel(0, tx_ring->head)" statement in
e1000_clean_tx_ring in e1000e_free_tx_resources will cause system crash,
because "tx_ring->head" is not assigned the value. In the code,
"tx_ring->head" is initialized in e1000_configure_tx in e1000_configure
after the e1000e_setup_rx_resources.
This patch fixes this problem, and it has been tested on the hardware.

Signed-off-by: Jia-Ju Bai <baijiaju1990@....com>
---
 drivers/net/ethernet/intel/e1000e/netdev.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 247335d..728328b 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -1737,6 +1737,8 @@ static void e1000_clean_rx_ring(struct e1000_ring *rx_ring)
 	rx_ring->next_to_use = 0;
 	adapter->flags2 &= ~FLAG2_IS_DISCARDING;
 
+	if (!rx_ring->head)
+		return;
 	writel(0, rx_ring->head);
 	if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
 		e1000e_update_rdt_wa(rx_ring, 0);
@@ -2444,6 +2446,8 @@ static void e1000_clean_tx_ring(struct e1000_ring *tx_ring)
 	tx_ring->next_to_use = 0;
 	tx_ring->next_to_clean = 0;
 
+	if (!tx_ring->head)
+		return;
 	writel(0, tx_ring->head);
 	if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
 		e1000e_update_tdt_wa(tx_ring, 0);
@@ -4357,6 +4361,9 @@ static int e1000_open(struct net_device *netdev)
 
 	netif_carrier_off(netdev);
 
+	adapter->tx_ring->head = NULL;
+	adapter->rx_ring->head = NULL;
+
 	/* allocate transmit descriptors */
 	err = e1000e_setup_tx_resources(adapter->tx_ring);
 	if (err)
-- 
1.7.9.5


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