XML: guard against content allocation failure

Report a memory error when libxml cannot allocate node content instead of
passing a NULL pointer to the string conversion path.

diff --git a/external/njs_xml_module.c b/external/njs_xml_module.c
index 08979becb40acb36c8ca6e29ea0eb406da773fb5..e745a5d6d6349e64dbd900582dab993490e177b0 100644 (file)
--- a/external/njs_xml_module.c
+++ b/external/njs_xml_module.c
@@ -988,6 +988,11 @@ njs_xml_node_ext_text(njs_vm_t *vm, njs_object_prop_t *unused, uint32_t unused1,
 
     if (retval != NULL && setval == NULL) {
         content.start = xmlNodeGetContent(current);
+        if (njs_slow_path(content.start == NULL)) {
+            njs_vm_memory_error(vm);
+            return NJS_ERROR;
+        }
+
         ret = njs_vm_value_string_create(vm, retval, content.start,
                                          njs_strlen(content.start));