[PATCH] e1000: Fix invalid memory reference

Fix an invalid memory reference in the e1000 driver which would cause
kernel panic.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Cc: Jeb Cramer <cramerj@intel.com>
Cc: John Ronciak <john.ronciak@intel.com>
Cc: Ganesh Venkatesan <ganesh.venkatesan@intel.com>
Cc: Jeff Garzik <jgarzik@pobox.com>
Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/drivers/net/e1000/e1000_param.c b/drivers/net/e1000/e1000_param.c
index 38695d5b4637..ccbbe5ad8e0f 100644
--- a/drivers/net/e1000/e1000_param.c
+++ b/drivers/net/e1000/e1000_param.c
@@ -545,7 +545,7 @@ e1000_check_fiber_options(struct e1000_adapter *adapter)
 static void __devinit
 e1000_check_copper_options(struct e1000_adapter *adapter)
 {
-        int speed, dplx;
+        int speed, dplx, an;
         int bd = adapter->bd_number;
 
         { /* Speed */
@@ -641,8 +641,12 @@ e1000_check_copper_options(struct e1000_adapter *adapter)
                                          .p = an_list }}
                 };
 
-                int an = AutoNeg[bd];
-                e1000_validate_option(&an, &opt, adapter);
+                if (num_AutoNeg > bd) {
+                        an = AutoNeg[bd];
+                        e1000_validate_option(&an, &opt, adapter);
+                } else {
+                        an = opt.def;
+                }
                 adapter->hw.autoneg_advertised = an;
         }