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| author | satoru takeuchi <satoru.takeuchi@gmail.com> | 2017-09-12 22:42:52 +0900 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-09-26 14:52:25 +0200 |
| commit | 6d6d282932d1a609e60dc4467677e0e863682f57 (patch) | |
| tree | 142569afd142892f054790b43311ab8d74e34063 /fs | |
| parent | ca6842bf01dc1ad41195eac1e343b4f08c496ba8 (diff) | |
| download | lwn-6d6d282932d1a609e60dc4467677e0e863682f57.tar.gz lwn-6d6d282932d1a609e60dc4467677e0e863682f57.zip | |
btrfs: prevent to set invalid default subvolid
`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")
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/ioctl.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index cf1c2ee030dd..d4a77993e52f 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -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) { |