CVE: CVE-2021-22945
Upstream-Status: Backport
Signed-off-by: Ross Burton <ross.burton@arm.com>

From 92cb3059dab2f9ef3e6ea614dad5c86917d19807 Mon Sep 17 00:00:00 2001
From: z2_ on hackerone <>
Date: Tue, 24 Aug 2021 09:50:33 +0200
Subject: [PATCH 1/3] mqtt: clear the leftovers pointer when sending succeeds

CVE-2021-22945

Bug: https://curl.se/docs/CVE-2021-22945.html
---
 lib/mqtt.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/mqtt.c b/lib/mqtt.c
index f077e6c3d..fcd40b41e 100644
--- a/lib/mqtt.c
+++ b/lib/mqtt.c
@@ -128,6 +128,10 @@ static CURLcode mqtt_send(struct Curl_easy *data,
     mq->sendleftovers = sendleftovers;
     mq->nsend = nsend;
   }
+  else {
+    mq->sendleftovers = NULL;
+    mq->nsend = 0;
+  }
   return result;
 }
 
-- 
2.25.1