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 <stable@xxxxxxxxxxxxxxx> know about it.
>From 6d6d282932d1a609e60dc4467677e0e863682f57 Mon Sep 17 00:00:00 2001
From: satoru takeuchi <satoru.takeuchi@xxxxxxxxx>
Date: Tue, 12 Sep 2017 22:42:52 +0900
Subject: btrfs: prevent to set invalid default subvolid
From: satoru takeuchi <satoru.takeuchi@xxxxxxxxx>
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@xxxxxxxxx>
Reviewed-by: Qu Wenruo <quwenruo.btrfs@xxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/ioctl.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -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 satoru.takeuchi@xxxxxxxxx are
queue-4.13/btrfs-prevent-to-set-invalid-default-subvolid.patch