libssh2: fix CVE-2020-22218

(From OE-Core rev: a0b41511766130883e93b5b8a07801a836beeb67)

Signed-off-by: Chee Yang Lee <chee.yang.lee@intel.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-support/libssh2/libssh2/CVE-2020-22218.patch

@@ -0,0 +1,34 @@
+CVE:  CVE-2020-22218
+Upstream-Status: Backport [ https://github.com/libssh2/libssh2/commit/642eec48ff3adfdb7a9e562b6d7fc865d1733f45 ]
+Signed-off-by: Lee Chee Yang <chee.yang.lee@intel.com>
+
+
+From 642eec48ff3adfdb7a9e562b6d7fc865d1733f45 Mon Sep 17 00:00:00 2001
+From: lutianxiong <lutianxiong@huawei.com>
+Date: Fri, 29 May 2020 01:25:40 +0800
+Subject: [PATCH] transport.c: fix use-of-uninitialized-value (#476)
+
+file:transport.c
+
+notes:
+return error if malloc(0)
+
+credit:
+lutianxiong
+---
+ src/transport.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/transport.c b/src/transport.c
+index 96fca6b8cc..adf96c2437 100644
+--- a/src/transport.c
++++ b/src/transport.c
+@@ -472,7 +472,7 @@ int _libssh2_transport_read(LIBSSH2_SESSION * session)
+             /* Get a packet handle put data into. We get one to
+                hold all data, including padding and MAC. */
+             p->payload = LIBSSH2_ALLOC(session, total_num);
+-            if(!p->payload) {
++            if(total_num == 0 || !p->payload) {
+                 return LIBSSH2_ERROR_ALLOC;
+             }
+             p->total_num = total_num;

meta/recipes-support/libssh2/libssh2_1.10.0.bb

@@ -10,6 +10,7 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=3e089ad0cf27edf1e7f261dfcd06acc7"
 SRC_URI = "http://www.libssh2.org/download/${BP}.tar.gz \
            file://fix-ssh2-test.patch \
            file://run-ptest \
+           file://CVE-2020-22218.patch \
            "
 
 SRC_URI[sha256sum] = "2d64e90f3ded394b91d3a2e774ca203a4179f69aebee03003e5a6fa621e41d51"