efivarfs: fix NULL dereference on resume

LSMs often inspect the path.mnt of files in the security hooks, and this
causes a NULL deref in efivarfs_pm_notify() because the path is
constructed with a NULL path.mnt.

Fix by obtaining from vfs_kern_mount() instead, and being very careful
to ensure that deactivate_super() (potentially triggered by a racing
userspace umount) is not called directly from the notifier, because it
would deadlock when efivarfs_kill_sb() tried to unregister the notifier
chain.

[ Al notes:
	Umm...  That's probably safe, but not as a long-term solution -
	it's too intimately dependent upon fs/super.c internals. The
	reasons why you can't run into ->s_umount deadlock here are
	non-trivial... ]

Cc: Al Viro <[email protected]>
Signed-off-by: James Bottomley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/r/3e998bf87638a442cbc6864cdcd3d8d9e08ce3e3.camel@HansenPartnership.com
Signed-off-by: Ard Biesheuvel <[email protected]>

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