curl: Fix for CVE-2021-22898

Applied trivial patch for cve issue CVE-2021-22898

Link: https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde

(From OE-Core rev: ba99fce9354555e556158a0af8ec809ae00cb62b)

Signed-off-by: Neetika.Singh <Neetika.Singh@kpit.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/curl/curl/CVE-2021-22898.patch

@@ -0,0 +1,26 @@
+From 39ce47f219b09c380b81f89fe54ac586c8db6bde Mon Sep 17 00:00:00 2001
+From: Harry Sintonen <sintonen@iki.fi>
+Date: Fri, 7 May 2021 13:09:57 +0200
+Subject: [PATCH] telnet: check sscanf() for correct number of matches
+
+CVE: CVE-2021-22898
+Upstream-Status: Backport
+Link: https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde
+Bug: https://curl.se/docs/CVE-2021-22898.html
+---
+ lib/telnet.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/lib/telnet.c b/lib/telnet.c
+index 26e0658ba9cc..fdd137fb0c04 100644
+--- a/lib/telnet.c
++++ b/lib/telnet.c
+@@ -922,7 +922,7 @@ static void suboption(struct Curl_easy *data)
+         size_t tmplen = (strlen(v->data) + 1);
+         /* Add the variable only if it fits */
+         if(len + tmplen < (int)sizeof(temp)-6) {
+-          if(sscanf(v->data, "%127[^,],%127s", varname, varval)) {
++          if(sscanf(v->data, "%127[^,],%127s", varname, varval) == 2) {
+             msnprintf((char *)&temp[len], sizeof(temp) - len,
+                       "%c%s%c%s", CURL_NEW_ENV_VAR, varname,
+                       CURL_NEW_ENV_VALUE, varval);

meta/recipes-support/curl/curl_7.69.1.bb

@@ -19,6 +19,7 @@ SRC_URI = "https://curl.haxx.se/download/curl-${PV}.tar.bz2 \
            file://CVE-2020-8286.patch \
            file://CVE-2021-22876.patch \
            file://CVE-2021-22890.patch \
+           file://CVE-2021-22898.patch \
 "
 
 SRC_URI[md5sum] = "ec5fc263f898a3dfef08e805f1ecca42"