btrfs: use memdup_user()
Remove open-coded memdup_user(). Note this changes some GFP_NOFS to GFP_KERNEL, since copy_from_user() may cause pagefault, it's pointless to pass GFP_NOFS to kmalloc(). Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Родитель
3939fcde24
Коммит
dae7b665cf
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@ -461,15 +461,9 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
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if (!vol_args)
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return -ENOMEM;
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if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
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ret = -EFAULT;
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goto out;
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}
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vol_args = memdup_user(arg, sizeof(*vol_args));
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if (IS_ERR(vol_args))
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return PTR_ERR(vol_args);
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vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
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namelen = strlen(vol_args->name);
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@ -545,7 +539,6 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
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out_unlock:
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mutex_unlock(&root->fs_info->volume_mutex);
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out:
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kfree(vol_args);
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return ret;
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}
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@ -565,15 +558,9 @@ static noinline int btrfs_ioctl_snap_create(struct file *file,
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if (root->fs_info->sb->s_flags & MS_RDONLY)
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return -EROFS;
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vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
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if (!vol_args)
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return -ENOMEM;
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if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
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ret = -EFAULT;
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goto out;
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}
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vol_args = memdup_user(arg, sizeof(*vol_args));
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if (IS_ERR(vol_args))
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return PTR_ERR(vol_args);
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vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
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namelen = strlen(vol_args->name);
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@ -675,19 +662,13 @@ static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
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vol_args = memdup_user(arg, sizeof(*vol_args));
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if (IS_ERR(vol_args))
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return PTR_ERR(vol_args);
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if (!vol_args)
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return -ENOMEM;
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if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
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ret = -EFAULT;
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goto out;
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}
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vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
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ret = btrfs_init_new_device(root, vol_args->name);
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out:
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kfree(vol_args);
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return ret;
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}
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@ -703,19 +684,13 @@ static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
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if (root->fs_info->sb->s_flags & MS_RDONLY)
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return -EROFS;
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vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
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vol_args = memdup_user(arg, sizeof(*vol_args));
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if (IS_ERR(vol_args))
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return PTR_ERR(vol_args);
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if (!vol_args)
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return -ENOMEM;
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if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
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ret = -EFAULT;
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goto out;
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}
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vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
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ret = btrfs_rm_device(root, vol_args->name);
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out:
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kfree(vol_args);
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return ret;
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}
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@ -635,14 +635,9 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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vol = kmalloc(sizeof(*vol), GFP_KERNEL);
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if (!vol)
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return -ENOMEM;
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if (copy_from_user(vol, (void __user *)arg, sizeof(*vol))) {
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ret = -EFAULT;
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goto out;
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}
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vol = memdup_user((void __user *)arg, sizeof(*vol));
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if (IS_ERR(vol))
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return PTR_ERR(vol);
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switch (cmd) {
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case BTRFS_IOC_SCAN_DEV:
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@ -650,7 +645,7 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
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&btrfs_fs_type, &fs_devices);
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break;
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}
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out:
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kfree(vol);
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return ret;
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}
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