diff --git a/src/zlib/infback.c b/src/zlib/infback.c
index 110b03b857..e9709984a8 100644
--- a/src/zlib/infback.c
+++ b/src/zlib/infback.c
@@ -434,6 +434,9 @@ void FAR *out_desc;
                 }
             }
 
+            if (state->mode == BAD)
+                break;
+
             /* build code tables */
             state->next = state->codes;
             state->lencode = (code const FAR *)(state->next);
diff --git a/src/zlib/inflate.c b/src/zlib/inflate.c
index a53b5c7446..be67fd6920 100644
--- a/src/zlib/inflate.c
+++ b/src/zlib/inflate.c
@@ -861,6 +861,9 @@ int flush;
                 }
             }
 
+            if (state->mode == BAD)
+                break;
+
             /* build code tables */
             state->next = state->codes;
             state->lencode = (code const FAR *)(state->next);