Resolves: CVE-2021-22945 - fix use-after-free and double-free in MQTT sending

0007-curl-7.76.1-CVE-2021-22945.patch

@@ -0,0 +1,33 @@
+From bb7619897e53ed424e0712ca5a4c93d5fae99715 Mon Sep 17 00:00:00 2001
+From: z2_ on hackerone <>
+Date: Tue, 24 Aug 2021 09:50:33 +0200
+Subject: [PATCH] mqtt: clear the leftovers pointer when sending succeeds
+
+CVE-2021-22945
+
+Bug: https://curl.se/docs/CVE-2021-22945.html
+
+Upstream-commit: 43157490a5054bd24256fe12876931e8abc9df49
+Signed-off-by: Kamil Dudka <kdudka@redhat.com>
+---
+ lib/mqtt.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/lib/mqtt.c b/lib/mqtt.c
+index d88fa73..f3fc045 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;
+ }
+ 
+-- 
+2.31.1
+

curl.spec

@@ -1,7 +1,7 @@
 Summary: A utility for getting files from remote servers (FTP, HTTP, and others)
 Name: curl
 Version: 7.76.1
-Release: 11%{?dist}
+Release: 12%{?dist}
 License: MIT
 Source: https://curl.se/download/%{name}-%{version}.tar.xz
 
@@ -23,6 +23,9 @@ Patch5:   0005-curl-7.76.1-CVE-2021-22924.patch
 # fix TELNET stack contents disclosure again (CVE-2021-22925)
 Patch6:   0006-curl-7.76.1-CVE-2021-22925.patch
 
+# fix use-after-free and double-free in MQTT sending (CVE-2021-22945)
+Patch7:   0007-curl-7.76.1-CVE-2021-22945.patch
+
 # patch making libcurl multilib ready
 Patch101: 0101-curl-7.32.0-multilib.patch
 
@@ -204,6 +207,7 @@ be installed.
 %patch4 -p1
 %patch5 -p1
 %patch6 -p1
+%patch7 -p1
 
 # Fedora patches
 %patch101 -p1
@@ -383,6 +387,9 @@ rm -f ${RPM_BUILD_ROOT}%{_libdir}/libcurl.la
 %{_libdir}/libcurl.so.4.[0-9].[0-9].minimal
 
 %changelog
+* Fri Sep 17 2021 Kamil Dudka <kdudka@redhat.com> - 7.76.1-12
+- fix use-after-free and double-free in MQTT sending (CVE-2021-22945)
+
 * Mon Aug 09 2021 Mohan Boddu <mboddu@redhat.com> - 7.76.1-11
 - Rebuilt for IMA sigs, glibc 2.34, aarch64 flags
   Related: rhbz#1991688