drivers/net/wan: Use memdup_user

Use memdup_user when user data is immediately copied into the
allocated region.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression from,to,size,flag;
position p;
identifier l1,l2;
@@

-  to = \(kmalloc@p\|kzalloc@p\)(size,flag);
+  to = memdup_user(from,size);
   if (
-      to==NULL
+      IS_ERR(to)
                 || ...) {
   <+... when != goto l1;
-  -ENOMEM
+  PTR_ERR(to)
   ...+>
   }
-  if (copy_from_user(to, from, size) != 0) {
-    <+... when != goto l2;
-    -EFAULT
-    ...+>
-  }
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julia Lawall 2010-05-21 22:20:26 +00:00 committed by David S. Miller
parent c5dc9a3581
commit c146fc9fc9

View file

@ -1211,14 +1211,9 @@ static int sdla_xfer(struct net_device *dev, struct sdla_mem __user *info, int r
}
else
{
temp = kmalloc(mem.len, GFP_KERNEL);
if (!temp)
return(-ENOMEM);
if(copy_from_user(temp, mem.data, mem.len))
{
kfree(temp);
return -EFAULT;
}
temp = memdup_user(mem.data, mem.len);
if (IS_ERR(temp))
return PTR_ERR(temp);
sdla_write(dev, mem.addr, temp, mem.len);
kfree(temp);
}