Commit: patch 9.0.2103: recursive callback may cause issues on some archs

[Christian Brabandt]

patch 9.0.2103: recursive callback may cause issues on some archs

Commit: https://github.com/vim/vim/commit/2076463e383901cef44685aaf4b63e4306444f9e
Author: Christian Brabandt <c...@256bit.org>
Date: Sun Nov 12 16:59:29 2023 +0100

patch 9.0.2103: recursive callback may cause issues on some archs

Problem: recursive callback may cause issues on some archs
Solution: Decrease the limit drastically to 20

Recursive callback limit causes problems on some architectures

Since commit 47510f3d6598a1218958c03ed11337a43b73f48d we have a test
that causes a recursive popup callback function to be executed. However
it seems the current limit of 'maxfuncdepth' option value is still too
recursive for some 32bit architectures (e.g. 32bit ARM).

So instead of allowing a default limit of 100 (default value for
'maxfuncdepth'), let's reduce this limit to 20. I don't think there is a
use case where one would need such a high recursive callback limit and a
limit of 20 seems reasonable (although it is currently hard-coded).

closes: #13495
closes: #13502

Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/doc/message.txt b/runtime/doc/message.txt
index 240f2c432..f8a9fdfa6 100644
--- a/runtime/doc/message.txt
+++ b/runtime/doc/message.txt
@@ -1,4 +1,4 @@
-*message.txt* For Vim version 9.0. Last change: 2023 May 24
+*message.txt* For Vim version 9.0. Last change: 2023 Nov 08


VIM REFERENCE MANUAL by Bram Moolenaar
@@ -135,6 +135,8 @@ This happens when an Ex command executes an Ex command that executes an Ex
command, etc. The limit is 200 or the value of 'maxfuncdepth', whatever is
larger. When it's more there probably is an endless loop. Probably a
|:execute| or |:source| command is involved.
+Can also happen with a recursive callback function (|job-callback|).
+A limit of 20 is used here.

*E254*
Cannot allocate color {name} ~
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 76efc5d41..77efbd63f 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -5486,7 +5486,6 @@ A jump table for the options with a short description can be found at |Q_op|.
Increasing this limit above 200 also changes the maximum for Ex
command recursion, see |E169|.
See also |:function|.
- Also used for maximum depth of callback functions.

*'maxmapdepth'* *'mmd'* *E223*
'maxmapdepth' 'mmd' number (default 1000)
diff --git a/src/userfunc.c b/src/userfunc.c
index 5ef0f7d9c..33e73a9a5 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -14,6 +14,9 @@
#include "vim.h"

#if defined(FEAT_EVAL) || defined(PROTO)
+
+#define MAX_CALLBACK_DEPTH 20
+
/*
* All user-defined functions are found in this hashtable.
*/
@@ -3584,7 +3587,7 @@ call_callback(
if (callback->cb_name == NULL || *callback->cb_name == NUL)
return FAIL;

- if (callback_depth > p_mfd)
+ if (callback_depth > MAX_CALLBACK_DEPTH)
{
emsg(_(e_command_too_recursive));
return FAIL;
diff --git a/src/version.c b/src/version.c
index 238e3df10..8afbc403d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@ static char *(features[]) =

static int included_patches[] =
{ /* Add new patch number below this line */
+/**/
+ 2103,
/**/
2102,
/**/