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btrfs: prevent to set invalid default subvolid

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commit 6d6d282932d1a609e60dc4467677e0e863682f57 upstream.

`btrfs sub set-default` succeeds to set an ID which isn't corresponding to any
fs/file tree. If such the bad ID is set to a filesystem, we can't mount this
filesystem without specifying `subvol` or `subvolid` mount options.

Fixes: 6ef5ed0d386b ("Btrfs: add ioctl and incompat flag to set the default mount subvol")
Signed-off-by: Satoru Takeuchi <satoru.takeuchi@gmail.com>
Reviewed-by: Qu Wenruo <quwenruo.btrfs@gmx.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
satoru takeuchi 2017-09-12 22:42:52 +09:00 committed by Greg Kroah-Hartman
parent ba44bc49ba
commit f11525d7ff
1 changed files with 4 additions and 0 deletions

4
fs/btrfs/ioctl.c

@ -4082,6 +4082,10 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
ret = PTR_ERR(new_root);
goto out;
}
if (!is_fstree(new_root->objectid)) {
ret = -ENOENT;
goto out;
}
path = btrfs_alloc_path();
if (!path) {