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landlock_put_hierarchy() can be called when an error occurs in landlock_merge_ruleset() due to insufficient memory. In this case, the domain's audit details might not have been allocated yet, which would cause landlock_free_hierarchy_details() to print a warning (but still safely handle this case). We could keep the WARN_ON_ONCE(!hierarchy) but it's not worth it for this kind of function, so let's remove it entirely. Cc: Paul Moore <paul@paul-moore.com> Reported-by: syzbot+8bca99e91de7e060e4ea@syzkaller.appspotmail.com Link: https://lore.kernel.org/r/20250331104709.897062-1-mic@digikod.net Reviewed-by: Günther Noack <gnoack@google.com> Signed-off-by: Mickaël Salaün <mic@digikod.net>