Validate parser parameter to XML_MemRealloc

diff --git a/expat/lib/xmlparse.c b/expat/lib/xmlparse.c
index ac604f58c0f6768a3fa3148c89c2f453fd60694f..95e48fc1468fc9a63c622de8c1f7c637202ae838 100644 (file)
--- a/expat/lib/xmlparse.c
+++ b/expat/lib/xmlparse.c
@@ -2098,6 +2098,8 @@ XML_MemMalloc(XML_Parser parser, size_t size)
 void * XMLCALL
 XML_MemRealloc(XML_Parser parser, void *ptr, size_t size)
 {
+  if (parser == NULL)
+    return NULL;
   return REALLOC(ptr, size);
 }