From 30f0b014b7ff3cd1b5f041bf7ce73448dc0d0fe8 Mon Sep 17 00:00:00 2001
From: pingcap-github-bot <sre-bot@pingcap.com>
Date: Fri, 5 Jun 2020 18:39:25 +0800
Subject: [PATCH] schedule: fix panic issue after delete the rule (#2513)
 (#2515)

Signed-off-by: nolouch <nolouch@gmail.com>
---
 server/schedule/placement/fit.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/server/schedule/placement/fit.go b/server/schedule/placement/fit.go
index 5556ec24fe6..8f35d30862c 100644
--- a/server/schedule/placement/fit.go
+++ b/server/schedule/placement/fit.go
@@ -59,6 +59,9 @@ func (f *RegionFit) GetRuleFit(peerID uint64) *RuleFit {
 // It returns 1 when the first fit result is better.
 func CompareRegionFit(a, b *RegionFit) int {
 	for i := range a.RuleFits {
+		if i >= len(b.RuleFits) {
+			break
+		}
 		if cmp := compareRuleFit(a.RuleFits[i], b.RuleFits[i]); cmp != 0 {
 			return cmp
 		}