drivers/block: use memdup_user
commitad96a7a7ea950d5bc9755f2f568be185c7070f1e
authorJulia Lawall <julia@diku.dk>
Wed, 21 Jul 2010 02:08:59 +0000 (20 20:08 -0600)
committerJens Axboe <jaxboe@fusionio.com>
Sat, 7 Aug 2010 16:52:31 +0000 (7 18:52 +0200)
treeec2d2c8e2d48c241e05d2acf6506a7105d3ed17c
parent6a32a8aed509e71137043d464db4a7fcd88c903e
drivers/block: use memdup_user

Use memdup_user when user data is immediately copied into the
allocated region.  Some checkpatch cleanups in nearby code.

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>
Cc: Chirag Kantharia <chirag.kantharia@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
drivers/block/cpqarray.c