diff options
| author | Julia Lawall <julia@diku.dk> | 2010-10-29 15:14:18 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2010-10-29 15:14:18 -0400 |
| commit | 2354d08fe9aeec3e451b85cb5387a6b28dbca0b1 (patch) | |
| tree | 7a3f43dfac81fc54faf231400a4b871ca24bb031 | |
| parent | 18e503d695ff8ff9a43768555aa74575bf6b77f3 (diff) | |
| download | linux-2354d08fe9aeec3e451b85cb5387a6b28dbca0b1.tar.bz2 | |
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>
| -rw-r--r-- | fs/btrfs/ioctl.c | 20 |
1 files changed, 6 insertions, 14 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index db0b8fc59235..8079ebfeaf50 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1073,14 +1073,10 @@ static noinline int btrfs_ioctl_tree_search(struct file *file, if (!capable(CAP_SYS_ADMIN)) return -EPERM; - args = kmalloc(sizeof(*args), GFP_KERNEL); - if (!args) - return -ENOMEM; + args = memdup_user(argp, sizeof(*args)); + if (IS_ERR(args)) + return PTR_ERR(args); - if (copy_from_user(args, argp, sizeof(*args))) { - kfree(args); - return -EFAULT; - } inode = fdentry(file)->d_inode; ret = search_ioctl(inode, args); if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) @@ -1188,14 +1184,10 @@ static noinline int btrfs_ioctl_ino_lookup(struct file *file, if (!capable(CAP_SYS_ADMIN)) return -EPERM; - args = kmalloc(sizeof(*args), GFP_KERNEL); - if (!args) - return -ENOMEM; + args = memdup_user(argp, sizeof(*args)); + if (IS_ERR(args)) + return PTR_ERR(args); - if (copy_from_user(args, argp, sizeof(*args))) { - kfree(args); - return -EFAULT; - } inode = fdentry(file)->d_inode; if (args->treeid == 0) |