atm: [he] limit queries to the device's register space

From: "Robert T. Johnson" <rtjohnso@eecs.berkeley.edu>
Signed-off-by: Chas Williams <chas@cmf.nrl.navy.mil>

diff --git a/drivers/atm/he.c b/drivers/atm/he.c
index 320320e..fc636a3 100644 (file)
--- a/drivers/atm/he.c
+++ b/drivers/atm/he.c
@@ -2845,10 +2845,15 @@ he_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user *arg)
                        if (copy_from_user(&reg, arg,
                                           sizeof(struct he_ioctl_reg)))
                                return -EFAULT;
-                       
+
                        spin_lock_irqsave(&he_dev->global_lock, flags);
                        switch (reg.type) {
                                case HE_REGTYPE_PCI:
+                                       if (reg.addr < 0 || reg.addr >= HE_REGMAP_SIZE) {
+                                               err = -EINVAL;
+                                               break;
+                                       }
+
                                        reg.val = he_readl(he_dev, reg.addr);
                                        break;
                                case HE_REGTYPE_RCM: