mlx4: Fix access to freed memory

catas_reset() uses pointer to mlx4_priv, but mlx4_priv is not valid
after call mlx4_restart_one().

Signed-off-by: Vitaliy Gusev <vgusev@openvz.org>
Acked-by: Roland Dreier <rolandd@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/mlx4/catas.c b/drivers/net/mlx4/catas.c
index aa9674b..f599294 100644 (file)
--- a/drivers/net/mlx4/catas.c
+++ b/drivers/net/mlx4/catas.c
@@ -96,12 +96,17 @@ static void catas_reset(struct work_struct *work)
        spin_unlock_irq(&catas_lock);
 
        list_for_each_entry_safe(priv, tmppriv, &tlist, catas_err.list) {
+               struct pci_dev *pdev = priv->dev.pdev;
+
                ret = mlx4_restart_one(priv->dev.pdev);
-               dev = &priv->dev;
+               /* 'priv' now is not valid */
                if (ret)
-                       mlx4_err(dev, "Reset failed (%d)\n", ret);
-               else
+                       printk(KERN_ERR "mlx4 %s: Reset failed (%d)\n",
+                               pci_name(pdev), ret);
+               else {
+                       dev  = pci_get_drvdata(pdev);
                        mlx4_dbg(dev, "Reset succeeded\n");
+               }
        }
 }