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/openbmc/linux/fs/btrfs/ |
H A D | ioctl.c | 2354d08f Fri Oct 29 14:14:18 CDT 2010 Julia Lawall <julia@diku.dk> Btrfs: use memdup_user helpers
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> Cc: Chris Mason <chris.mason@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Chris Mason <chris.mason@oracle.com>
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