From 8c697e3698e7dbe0a3c4524ac360b78ceb852b23 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Tue, 28 Dec 2021 20:18:50 +0000
Subject: [PATCH] patch 8.2.3927: Vim9: double free when using lambda

Problem:    Vim9: double free when using lambda.
Solution:   Don't free both cmdline and line_to_free.
---
 src/userfunc.c | 3 ++-
 src/version.c  | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/userfunc.c b/src/userfunc.c
index b87cdedb68..c894c5896e 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -1146,7 +1146,8 @@ lambda_function_body(
     ga_init2(&newlines, (int)sizeof(char_u *), 10);
     if (get_function_body(&eap, &newlines, NULL, &line_to_free) == FAIL)
     {
-	vim_free(cmdline);
+	if (cmdline != line_to_free)
+	    vim_free(cmdline);
 	goto erret;
     }
 
diff --git a/src/version.c b/src/version.c
index e091971833..4d8110510a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -749,6 +749,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3927,
 /**/
     3926,
 /**/