Patchwork [70/81] tg3: Avoid null pointer dereference in tg3_interrupt in netconsole mode

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Submitter Herton Ronaldo Krzesinski
Date Feb. 19, 2013, 6:49 p.m.
Message ID <1361299784-8830-71-git-send-email-herton.krzesinski@canonical.com>
Download mbox | patch
Permalink /patch/221839/
State New
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Comments

Herton Ronaldo Krzesinski - Feb. 19, 2013, 6:49 p.m.
3.5.7.6 -stable review patch.  If anyone has any objections, please let me know.

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

From: Nithin Nayak Sujir <nsujir@broadcom.com>

commit 9c13cb8bb477a83b9a3c9e5a5478a4e21294a760 upstream.

When netconsole is enabled, logging messages generated during tg3_open
can result in a null pointer dereference for the uninitialized tg3
status block. Use the irq_sync flag to disable polling in the early
stages. irq_sync is cleared when the driver is enabling interrupts after
all initialization is completed.

Signed-off-by: Nithin Nayak Sujir <nsujir@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
---
 drivers/net/ethernet/broadcom/tg3.c |    4 ++++
 1 file changed, 4 insertions(+)

Patch

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 15f8b00..82a8ed2 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -6594,6 +6594,9 @@  static void tg3_poll_controller(struct net_device *dev)
 	int i;
 	struct tg3 *tp = netdev_priv(dev);
 
+	if (tg3_irq_sync(tp))
+		return;
+
 	for (i = 0; i < tp->irq_cnt; i++)
 		tg3_interrupt(tp->napi[i].irq_vec, &tp->napi[i]);
 }
@@ -15556,6 +15559,7 @@  static int __devinit tg3_init_one(struct pci_dev *pdev,
 	tp->pm_cap = pm_cap;
 	tp->rx_mode = TG3_DEF_RX_MODE;
 	tp->tx_mode = TG3_DEF_TX_MODE;
+	tp->irq_sync = 1;
 
 	if (tg3_debug > 0)
 		tp->msg_enable = tg3_debug;