Btrfs: cleanup fs/btrfs/super.c::btrfs_control_ioctl()
- Remove the unused local variable 'len';
- Check return value of kmalloc().
Signed-off-by: Wang Cong <wangcong@zeuux.org>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 92c9b54..795b624 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -583,17 +583,18 @@
struct btrfs_ioctl_vol_args *vol;
struct btrfs_fs_devices *fs_devices;
int ret = -ENOTTY;
- int len;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
vol = kmalloc(sizeof(*vol), GFP_KERNEL);
+ if (!vol)
+ return -ENOMEM;
+
if (copy_from_user(vol, (void __user *)arg, sizeof(*vol))) {
ret = -EFAULT;
goto out;
}
- len = strnlen(vol->name, BTRFS_PATH_NAME_MAX);
switch (cmd) {
case BTRFS_IOC_SCAN_DEV: