[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@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 0acee9f324e9..256969e1300c 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);