[Patch] MdeModulePkg/RegularExpressionDxe: Add two missing null pointer checks

["Liming Gao" <liming.gao@intel.com>]

After update Oniguruma from v6.9.0 to v6.9.3, two null pointer check
should be added.
This change bases on the patch https://edk2.groups.io/g/devel/message/45183.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Signed-off-by: Liming Gao <liming.gao@intel.com>
---
 MdeModulePkg/Universal/RegularExpressionDxe/Oniguruma/regparse.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/MdeModulePkg/Universal/RegularExpressionDxe/Oniguruma/regparse.c b/MdeModulePkg/Universal/RegularExpressionDxe/Oniguruma/regparse.c
index 4605d40bd1..2b121690e1 100644
--- a/MdeModulePkg/Universal/RegularExpressionDxe/Oniguruma/regparse.c
+++ b/MdeModulePkg/Universal/RegularExpressionDxe/Oniguruma/regparse.c
@@ -1955,6 +1955,7 @@ callout_tag_entry(ScanEnv* env, regex_t* reg, UChar* name, UChar* name_end,
 
   ext = onig_get_regex_ext(reg);
   CHECK_NULL_RETURN_MEMERR(ext);
+  CHECK_NULL_RETURN_MEMERR(ext->tag_table);
   r = callout_tag_entry_raw(env, ext->tag_table, name, name_end, entry_val);
 
   e = onig_reg_callout_list_at(reg, (int )entry_val);
@@ -3277,6 +3278,7 @@ node_new_str_raw_char(UChar c)
 
   p[0] = c;
   node = node_new_str_raw(p, p + 1);
+  CHECK_NULL_RETURN(node);
 
   /* clear buf tail */
   for (i = 1; i < NODE_STRING_BUF_SIZE; i++)
-- 
2.13.0.windows.1