[Buildroot] [PATCH] package/libyang: security bump to version 1.0.240

[Peter Korsgaard]

Fixes the following security issues:

- CVE-2021-28902: In function read_yin_container() in libyang <= v1.0.225,
  it doesn't check whether the value of retval->ext[r] is NULL.  In some
  cases, it can be NULL, which leads to the operation of
  retval->ext[r]->flags that results in a crash.

- CVE-2021-28903: A stack overflow in libyang <= v1.0.225 can cause a denial
  of service through function lyxml_parse_mem().  lyxml_parse_elem()
  function will be called recursively, which will consume stack space and
  lead to crash.

- CVE-2021-28904: In function ext_get_plugin() in libyang <= v1.0.225, it
  doesn't check whether the value of revision is NULL.  If revision is NULL,
  the operation of strcmp(revision, ext_plugins[u].revision) will lead to a
  crash.

- CVE-2021-28905: In function lys_node_free() in libyang <= v1.0.225, it
  asserts that the value of node->module can't be NULL.  But in some cases,
  node->module can be null, which triggers a reachable assertion (CWE-617).

- CVE-2021-28906: In function read_yin_leaf() in libyang <= v1.0.225, it
  doesn't check whether the value of retval->ext[r] is NULL.  In some cases,
  it can be NULL, which leads to the operation of retval->ext[r]->flags that
  results in a crash.

Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 package/libyang/libyang.hash | 2 +-
 package/libyang/libyang.mk   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/package/libyang/libyang.hash b/package/libyang/libyang.hash
index 94685cb4de..755ecf390a 100644
--- a/package/libyang/libyang.hash
+++ b/package/libyang/libyang.hash
@@ -1,3 +1,3 @@
 # Locally calculated
-sha256  1b736443d2c69b5d7a71ac412655e6edab0647b18f35f7bf504b0a24e06cb046  libyang-1.0.225.tar.gz
+sha256  8576cad398b451b1c622b0652a2030fcf83ee1d9a39e6cd93d17b0a5a43118d6  libyang-1.0.240.tar.gz
 sha256  f942fe693e03e4e3ff67a351c00dc8f468a042e0d7273b0aa6bc53060b568112  LICENSE
diff --git a/package/libyang/libyang.mk b/package/libyang/libyang.mk
index ed61ec97d2..f784367ea3 100644
--- a/package/libyang/libyang.mk
+++ b/package/libyang/libyang.mk
@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBYANG_VERSION = 1.0.225
+LIBYANG_VERSION = 1.0.240
 LIBYANG_SITE = $(call github,CESNET,libyang,v$(LIBYANG_VERSION))
 LIBYANG_LICENSE = BSD-3-Clause
 LIBYANG_LICENSE_FILES = LICENSE
-- 
2.20.1