From 61942819f2c3b01323e72e065fc23452f78c2d17 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Mon, 20 Apr 2020 20:18:02 -0700
Subject: [PATCH] ircd::m::vm: Restore sequence number stackfully on
 completion.

---
 matrix/vm_execute.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/matrix/vm_execute.cc b/matrix/vm_execute.cc
index 1f91fe25a..6b92d5f3b 100644
--- a/matrix/vm_execute.cc
+++ b/matrix/vm_execute.cc
@@ -313,6 +313,11 @@ try
 		*eval.opts
 	};
 
+	const scope_restore eval_sequence
+	{
+		eval.sequence, 0UL
+	};
+
 	// The issue hook is only called when this server is injecting a newly
 	// created event.
 	if(eval.copts && eval.copts->issue)
@@ -535,7 +540,6 @@ ircd::m::vm::execute_pdu(eval &eval,
 	const auto *const &top(eval::seqmax());
 	eval.sequence_shared[0] = 0;
 	eval.sequence_shared[1] = 0;
-	eval.sequence = 0;
 	eval.sequence =
 	{
 		top?