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for-5.14-rc6-tag

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Merge tag 'for-5.14-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs fix from David Sterba:
 "One more fix for cross-rename, adding a missing check for directory
  and subvolume, this could lead to a crash"

* tag 'for-5.14-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: prevent rename2 from exchanging a subvol with a directory from different parents
This commit is contained in:
Linus Torvalds 2021-08-18 12:06:42 -07:00
commit d6d09a6942
1 changed files with 8 additions and 2 deletions
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10
fs/btrfs/inode.c
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@ -9226,8 +9226,14 @@ static int btrfs_rename_exchange(struct inode *old_dir,
bool dest_log_pinned = false;
bool need_abort = false;
/* we only allow rename subvolume link between subvolumes */
if (old_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest)
/*
* For non-subvolumes allow exchange only within one subvolume, in the
* same inode namespace. Two subvolumes (represented as directory) can
* be exchanged as they're a logical link and have a fixed inode number.
*/
if (root != dest &&
(old_ino != BTRFS_FIRST_FREE_OBJECTID ||
new_ino != BTRFS_FIRST_FREE_OBJECTID))
return -EXDEV;
/* close the race window with snapshot create/destroy ioctl */