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From: Markus Koschany <apo@debian.org>
Date: Sun, 23 Oct 2022 17:18:10 +0200
Subject: CVE-2022-0351
Origin: https://github.com/vim/vim/commit/fe6fb267e6ee5c5da2f41889e4e0e0ac5bf4b89d
---
src/eval.c | 10 ++++++++++
src/testdir/test_eval_stuff.vim | 5 +++++
2 files changed, 15 insertions(+)
--- a/src/eval.c
+++ b/src/eval.c
@@ -4159,6 +4159,7 @@ eval7(
char_u *start_leader, *end_leader;
int ret = OK;
char_u *alias;
+ static int recurse = 0;
/*
* Initialise variable so that clear_tv() can't mistake this for a
@@ -4174,6 +4175,14 @@ eval7(
*arg = skipwhite(*arg + 1);
end_leader = *arg;
+ // Limit recursion to 1000 levels. At least at 10000 we run out of stack
+ // and crash.
+ if (recurse == 1000)
+ {
+ return FAIL;
+ }
+ ++recurse;
+
switch (**arg)
{
/*
@@ -4481,6 +4490,7 @@ eval7(
}
}
+ --recurse;
return ret;
}
--- a/src/testdir/test_eval_stuff.vim
+++ b/src/testdir/test_eval_stuff.vim
@@ -94,3 +94,8 @@ func Test_let_errmsg()
call assert_fails('let v:errmsg = []', 'E730:')
let v:errmsg = ''
endfunc
+
+func Test_deep_recursion()
+ " this was running out of stack
+ call assert_fails("exe 'if ' . repeat('(', 1002)")
+endfunc
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