From: Bram Moolenaar <Bram@vim.org>
Date: Mon, 30 Dec 2019 18:19:53 +0000 (+0100)
Subject: patch 8.2.0061: the execute stack can grow big and never shrinks
X-Git-Tag: v8.2.0061
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3fbcc128cbd2311819cc5a7bb89e45669860f008;p=thirdparty%2Fvim.git

patch 8.2.0061: the execute stack can grow big and never shrinks

Problem:    The execute stack can grow big and never shrinks.
Solution:   Reduce the size in gargage collect.
---

diff --git a/src/eval.c b/src/eval.c
index c03372d1c9..739c73c9b6 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -3857,6 +3857,30 @@ garbage_collect(int testing)
 	garbage_collect_at_exit = FALSE;
     }
 
+    // The execution stack can grow big, limit the size.
+    if (exestack.ga_maxlen - exestack.ga_len > 500)
+    {
+	size_t	new_len;
+	char_u	*pp;
+	int	n;
+
+	// Keep 150% of the current size, with a minimum of the growth size.
+	n = exestack.ga_len / 2;
+	if (n < exestack.ga_growsize)
+	    n = exestack.ga_growsize;
+
+	// Don't make it bigger though.
+	if (exestack.ga_len + n < exestack.ga_maxlen)
+	{
+	    new_len = exestack.ga_itemsize * (exestack.ga_len + n);
+	    pp = vim_realloc(exestack.ga_data, new_len);
+	    if (pp == NULL)
+		return FAIL;
+	    exestack.ga_maxlen = exestack.ga_len + n;
+	    exestack.ga_data = pp;
+	}
+    }
+
     // We advance by two because we add one for items referenced through
     // previous_funccal.
     copyID = get_copyID();
diff --git a/src/version.c b/src/version.c
index 3a22ca41d8..f68e29fe4f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    61,
 /**/
     60,
 /**/