Patch "btrfs: prevent to set invalid default subvolid" has been added to the 4.13-stable tree

This is a note to let you know that I've just added the patch titled

btrfs: prevent to set invalid default subvolid

to the 4.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
btrfs-prevent-to-set-invalid-default-subvolid.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: satoru takeuchi <[email protected]>
Date: Tue, 12 Sep 2017 22:42:52 +0900
Subject: btrfs: prevent to set invalid default subvolid

From: satoru takeuchi <[email protected]>

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.

---
 fs/btrfs/ioctl.c |    4 ++++
 1 file changed, 4 insertions(+)

@@ -4072,6 +4072,10 @@ static long btrfs_ioctl_default_subvol(s
 		ret = PTR_ERR(new_root);
 		goto out;
 	}
+	if (!is_fstree(new_root->objectid)) {
+		ret = -ENOENT;
+		goto out;
+	}
 
 	path = btrfs_alloc_path();
 	if (!path) {

Patches currently in stable-queue which might be from [email protected] are

queue-4.13/btrfs-prevent-to-set-invalid-default-subvolid.patch