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@korsgaard.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
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