1 files changed, 4 insertions, 0 deletions
diff --git a/src/reader.c b/src/reader.c
index 1677ed92..354ff478 100644
--- a/src/reader.c
+++ b/src/reader.c
@@ -124,6 +124,10 @@ emit_statement(SerdReader* const reader,
     graph = reader->default_graph;
   }
 
+  if (reader->stack.size + (2 * sizeof(SerdNode)) > reader->stack.buf_size) {
+    return SERD_ERR_OVERFLOW;
+  }
+
   /* Zero the pad of the object node on the top of the stack.  Lower nodes
      (subject and predicate) were already zeroed by subsequent pushes. */
   serd_node_zero_pad(o);