Patch irqbalance to fix incorrect balancing behavior (microsoft#6359)

SPECS/irqbalance/fix-load-unsigned-overflow.patch

@@ -0,0 +1,25 @@
+From 2a66a666d3e202dec5b1a4309447e32d5f292871 Mon Sep 17 00:00:00 2001
+From: liuchao173 <[email protected]>
+Date: Tue, 24 Aug 2021 20:50:18 +0800
+Subject: [PATCH] fix unsigned integer subtraction sign overflow
+
+Min_load, adjustment_load  and load are unsigned integers, so it overflows when (lb_info->min_load + info->load) < (lb_info->adjustment_load - info->load). The result will be greater than zero. Therefore the irq cannot be selected to rebalanced.
+
+Signed-off-by: Henry Beberman <[email protected]>
+---
+ irqlist.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/irqlist.c b/irqlist.c
+index 9ab321a..4dd4a83 100644
+--- a/irqlist.c
++++ b/irqlist.c
+@@ -97,7 +97,7 @@ static void move_candidate_irqs(struct irq_info *info, void *data)
+ 	}
+
+ 	/* If we can migrate an irq without swapping the imbalance do it. */
+-	if ((lb_info->min_load + info->load) - (lb_info->adjustment_load - info->load) < delta_load) {
++	if ((lb_info->min_load + info->load) < delta_load + (lb_info->adjustment_load - info->load)) {
+ 		lb_info->adjustment_load -= info->load;
+ 		lb_info->min_load += info->load;
+ 		if (lb_info->min_load > lb_info->adjustment_load) {

SPECS/irqbalance/irqbalance.spec

@@ -1,14 +1,15 @@
 Summary:        Irqbalance daemon
 Name:           irqbalance
 Version:        1.8.0
-Release:        3%{?dist}
+Release:        4%{?dist}
 License:        GPLv2
 URL:            https://github.com/Irqbalance/irqbalance
 Group:          System Environment/Services
 Vendor:         Microsoft Corporation
 Distribution:   Mariner
 Source0:        https://github.com/Irqbalance/%{name}/archive/v%{version}.tar.gz#/%{name}-%{version}.tar.gz
 Patch0:         fix-format-security.patch
+Patch1:         fix-load-unsigned-overflow.patch
 BuildRequires:  systemd-devel
 BuildRequires:  glib-devel
 Requires:       systemd
@@ -57,6 +58,9 @@ make -k check |& tee %{_specdir}/%{name}-check-log || %{nocheck}
 %{_datadir}/*
 
 %changelog
+* Fri Oct 06 2023 Henry Beberman <[email protected]> - 1.8.0-4
+- Apply upstream fix for unsigned subtraction overflow in load calculation
+
 * Wed Sep 20 2023 Jon Slobodzian <[email protected]> - 1.8.0-3
 - Recompile with stack-protection fixed gcc version (CVE-2023-4039)