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btrfs: simplify kmalloc+copy_from_user to memdup_user

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Use memdup_user rather than duplicating its implementation
This is a little bit restricted to reduce false positives

The semantic patch that makes this report is available
in scripts/coccinelle/api/memdup_user.cocci.

More information about semantic patching is available at
http://coccinelle.lip6.fr/

Signed-off-by: Geyslan G. Bem <geyslan@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Geyslan G. Bem 2013-10-14 12:18:25 -03:00 committed by Chris Mason
parent 5ede859b00
commit 229eed4348
1 changed files with 3 additions and 8 deletions
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11
fs/btrfs/ioctl.c
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@ -2715,15 +2715,10 @@ static long btrfs_ioctl_file_extent_same(struct file *file,
size = sizeof(tmp) +
tmp.dest_count * sizeof(struct btrfs_ioctl_same_extent_info);
same = kmalloc(size, GFP_NOFS);
if (!same) {
ret = -EFAULT;
goto out;
}
same = memdup_user((struct btrfs_ioctl_same_args __user *)argp, size);
if (copy_from_user(same,
(struct btrfs_ioctl_same_args __user *)argp, size)) {
ret = -EFAULT;
if (IS_ERR(same)) {
ret = PTR_ERR(same);
goto out;
}