From 2fb109d83d1db294d158b7c7347a2815042db465 Mon Sep 17 00:00:00 2001
From: 0xbigz <83473873+0xbigz@users.noreply.github.com>
Date: Wed, 25 Oct 2023 15:43:58 -0400
Subject: [PATCH 1/2] bigz/add-validate_perp_market-in-update-max-imbalances

---
 programs/drift/src/instructions/admin.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/programs/drift/src/instructions/admin.rs b/programs/drift/src/instructions/admin.rs
index a95eb279a..eeca06ad5 100644
--- a/programs/drift/src/instructions/admin.rs
+++ b/programs/drift/src/instructions/admin.rs
@@ -1424,6 +1424,9 @@ pub fn handle_update_perp_market_max_imbalances(
     perp_market.unrealized_pnl_max_imbalance = unrealized_max_imbalance;
     perp_market.insurance_claim.quote_max_insurance = quote_max_insurance;
 
+    // ensure altered max_revenue_withdraw_per_period doesn't break invariant check
+    crate::validation::perp_market::validate_perp_market(perp_market)?;
+
     Ok(())
 }
 

From 41b9861e267ff0600f9f765d0d4f3dd3bffbc9da Mon Sep 17 00:00:00 2001
From: 0xbigz <83473873+0xbigz@users.noreply.github.com>
Date: Wed, 25 Oct 2023 15:45:09 -0400
Subject: [PATCH 2/2] update changelog

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index c14b8801c..1efa6678e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - program: add positive perp funding rate offset ([#576](https://github.com/drift-labs/protocol-v2/pull/576/files))
 
 ### Fixes
+- program: add validation check in update max imbalances ([#667](https://github.com/drift-labs/protocol-v2/pull/667))
 
 ### Breaking