openssh: Fix CVE-2021-28041

Added patch to fix CVE-2021-28041.

Link:
http://archive.ubuntu.com/ubuntu/pool/main/o/openssh/openssh_8.2p1-4ubuntu0.3.debian.tar.xz

(From OE-Core rev: 969e14a6849a4ec9030d09059e8d81dce0ff0c49)

Signed-off-by: Sana Kazi <Sana.Kazi@kpit.com>
Signed-off-by: Sana Kazi <sanakazisk19@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-connectivity/openssh/openssh/CVE-2021-28041.patch

@@ -0,0 +1,20 @@
+Description: fix double-free memory corruption in ssh-agent
+Author: Marc Deslauriers <marc.deslauriers@canonical.com>
+Origin: minimal fix for https://github.com/openssh/openssh-portable/commit/e04fd6dde16de1cdc5a4d9946397ff60d96568db
+
+Signed-off-by: Sana Kazi <Sana.Kazi@kpit.com>
+
+CVE: CVE-2021-28041
+Upstream-Status: Backport [http://archive.ubuntu.com/ubuntu/pool/main/o/openssh/openssh_8.2p1-4ubuntu0.3.debian.tar.xz]
+Comment: No change in any hunk
+
+--- a/ssh-agent.c
++++ b/ssh-agent.c
+@@ -496,6 +496,7 @@ process_add_identity(SocketEntry *e)
+				goto err;
+			}
+			free(ext_name);
++			ext_name = NULL;
+			break;
+		default:
+			error("%s: Unknown constraint %d", __func__, ctype);

meta/recipes-connectivity/openssh/openssh_8.2p1.bb

@@ -25,6 +25,7 @@ SRC_URI = "http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-${PV}.tar
            file://sshd_check_keys \
            file://add-test-support-for-busybox.patch \
            file://CVE-2020-14145.patch \
+           file://CVE-2021-28041.patch \
            "
 SRC_URI[md5sum] = "3076e6413e8dbe56d33848c1054ac091"
 SRC_URI[sha256sum] = "43925151e6cf6cee1450190c0e9af4dc36b41c12737619edff8bcebdff64e671"