From fb70f9393513908ee1b7267d24452ec2b9300b1c Mon Sep 17 00:00:00 2001
From: Oilbeater <mengxin@alauda.io>
Date: Wed, 29 Mar 2023 09:27:33 +0800
Subject: [PATCH] fix: memory leak in IPAM caused by leftover map keys (#2566)

When all nics are popped from the list the map key still exist which will lead memory leak each time a pod is deleted.

(cherry picked from commit 3f7997b319083e1f0b87a1739804849f299a6c2a)
---
 pkg/ipam/subnet.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkg/ipam/subnet.go b/pkg/ipam/subnet.go
index 3d6d978067b..a0fd1aa390a 100644
--- a/pkg/ipam/subnet.go
+++ b/pkg/ipam/subnet.go
@@ -159,6 +159,9 @@ func (subnet *Subnet) pushPodNic(podName, nicName string) {
 
 func (subnet *Subnet) popPodNic(podName, nicName string) {
 	subnet.PodToNicList[podName] = util.RemoveString(subnet.PodToNicList[podName], nicName)
+	if subnet.PodToNicList[podName] == nil {
+		delete(subnet.PodToNicList, podName)
+	}
 }
 
 func (subnet *Subnet) GetRandomAddress(podName, nicName string, mac string, skippedAddrs []string, checkConflict bool) (IP, IP, string, error) {