From 7b629a987258dcaba84d662edb5f408d11878fef Mon Sep 17 00:00:00 2001
From: MrBTTF <zhvladi@gmail.com>
Date: Mon, 1 Mar 2021 14:19:29 +0100
Subject: [PATCH] handling decoding pem error (#1192)

---
 AUTHORS | 1 +
 auth.go | 6 +++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/AUTHORS b/AUTHORS
index 3460c2e06..50afa2c85 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -92,6 +92,7 @@ Thomas Wodarek <wodarekwebpage at gmail.com>
 Tim Ruffles <timruffles at gmail.com>
 Tom Jenkinson <tom at tjenkinson.me>
 Vladimir Kovpak <cn007b at gmail.com>
+Vladyslav Zhelezniak <zhvladi at gmail.com>
 Xiangyu Hu <xiangyu.hu at outlook.com>
 Xiaobing Jiang <s7v7nislands at gmail.com>
 Xiuming Chen <cc at cxm.cc>
diff --git a/auth.go b/auth.go
index 1f9ceb059..b2f19e8f0 100644
--- a/auth.go
+++ b/auth.go
@@ -15,6 +15,7 @@ import (
 	"crypto/sha256"
 	"crypto/x509"
 	"encoding/pem"
+	"fmt"
 	"sync"
 )
 
@@ -371,7 +372,10 @@ func (mc *mysqlConn) handleAuthResult(oldAuthData []byte, plugin string) error {
 							return err
 						}
 
-						block, _ := pem.Decode(data[1:])
+						block, rest := pem.Decode(data[1:])
+						if block == nil {
+							return fmt.Errorf("No Pem data found, data: %s", rest)
+						}
 						pkix, err := x509.ParsePKIXPublicKey(block.Bytes)
 						if err != nil {
 							return err