linux-kernel - Re: tg3: unable to handle null pointer dereference [Re: Linux 2.6.21-rc6]

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Message-ID: <1175900233.7911.87.camel@dell>
Date:	Fri, 06 Apr 2007 15:57:13 -0700
From:	"Michael Chan" <mchan@...adcom.com>
To:	"Nishanth Aravamudan" <nacc@...ibm.com>, davem@...emloft.net
cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"LKML" <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org
Subject: Re: tg3: unable to handle null pointer dereference [Re: Linux
 2.6.21-rc6]

On Fri, 2007-04-06 at 14:40 -0700, Nishanth Aravamudan wrote:

> 2.6.21-rc5 is ok. 2.6.21-rc6 results in
> 
> [   14.241665] Unable to handle kernel NULL pointer dereference (address 0000000000000000)

Sorry, I think this should fix it:

[TG3]: Fix crash during tg3_init_one().

The driver will crash when the chip has been initialized by EFI before
tg3_init_one().  In this case, the driver will call tg3_chip_reset()
before allocating consistent memory.

The bug is fixed by checking for tp->hw_status before accessing it
during tg3_chip_reset().

Signed-off-by: Michael Chan <mchan@...adcom.com>

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 0acee9f..256969e 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -4834,8 +4834,10 @@ static int tg3_chip_reset(struct tg3 *tp)
 	 * sharing or irqpoll.
 	 */
 	tp->tg3_flags |= TG3_FLAG_CHIP_RESETTING;
-	tp->hw_status->status = 0;
-	tp->hw_status->status_tag = 0;
+	if (tp->hw_status) {
+		tp->hw_status->status = 0;
+		tp->hw_status->status_tag = 0;
+	}
 	tp->last_tag = 0;
 	smp_mb();
 	synchronize_irq(tp->pdev->irq);




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