tree f6b4168aa691ca0b41e8cec8233e6b55ab368758
parent 90fe1515b0d0c3b6a6791a8830634866335de049
author Josef Bacik <josef@toxicpanda.com> 1713371037 -0400
committer Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com> 1715006193 +0000

btrfs: do not allow non subvolume root targets for snapshot

[ Upstream commit a8892fd71933126ebae3d60aec5918d4dceaae76 ]

Our btrfs subvolume snapshot <source> <destination> utility enforces
that <source> is the root of the subvolume, however this isn't enforced
in the kernel.  Update the kernel to also enforce this limitation to
avoid problems with other users of this ioctl that don't have the
appropriate checks in place.

Reported-by: Martin Michaelis <code@mgjm.de>
CC: stable@vger.kernel.org # 4.14+
Reviewed-by: Neal Gompa <neal@gompa.dev>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>