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btrfs: prevent to set invalid default subvolid

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`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: 6ef5ed0d38 ("Btrfs: add ioctl and incompat flag to set the default mount subvol")
Cc: <stable@vger.kernel.org>
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>
This commit is contained in:
satoru takeuchi 2017-09-12 22:42:52 +09:00 committed by David Sterba
parent ca6842bf01
commit 6d6d282932
1 changed files with 4 additions and 0 deletions
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4
fs/btrfs/ioctl.c
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@ -4057,6 +4057,10 @@ 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) {