commit 82aa6e09e02b138ab7ee6b79ecac487813f117e5
author Bram Moolenaar <Bram@vim.org> Sun Jan 17 22:04:02 2021 +0100
committer Bram Moolenaar <Bram@vim.org> Sun Jan 17 22:04:02 2021 +0100
tree d0a7cb1a7de006d723b18f77da135788c63bb435
parent f30a14db3b26e510f193f50ee0dd8a41303e4740

patch 8.2.2374: accessing uninitialized memory in test_undo

Problem:    Accessing uninitialized memory in test_undo.
Solution:   Do not look in typebuf.tb_buf if it is empty. (Dominique Pellé,
            closes #7697)

src/edit.c

diff --git a/src/edit.c b/src/edit.c
index a152d84..35e4bc2 100644
--- a/src/edit.c
+++ b/src/edit.c
@@ -1586,7 +1586,7 @@
     // Recognize:
     // form 0: {lead}{key};{modifier}u
     // form 1: {lead}27;{modifier};{key}~
-    if ((c == CSI || (c == ESC && *p == '[')) && typebuf.tb_len >= 4)
+    if (typebuf.tb_len >= 4 && (c == CSI || (c == ESC && *p == '[')))
     {
 	idx = (*p == '[');
 	if (p[idx] == '2' && p[idx + 1] == '7' && p[idx + 2] == ';')