From 383cd49b11ae32e136263d7555d7c593fc57bfef Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 20 Apr 2020 17:03:18 +0200
Subject: mqtt: fix Curl_read()  error handling while reading remaining length

Detected by Coverity. CID 1462320.
---
 lib/mqtt.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/mqtt.c b/lib/mqtt.c
index 35c1b3e83..44433361b 100644
--- a/lib/mqtt.c
+++ b/lib/mqtt.c
@@ -569,6 +569,8 @@ static CURLcode mqtt_doing(struct connectdata *conn, bool *done)
         Curl_debug(data, CURLINFO_HEADER_IN, (char *)&byte, 1);
       pkt[mq->npacket++] = byte;
     } while((byte & 0x80) && (mq->npacket < 4));
+    if(result)
+      break;
     mq->remaining_length = mqtt_decode_len(&pkt[0], mq->npacket, NULL);
     mq->npacket = 0;
     if(mq->remaining_length) {
-- 
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