From 73b2d3790cad5694fc0ed0db2926e4220c48d968 Mon Sep 17 00:00:00 2001
From: Christian Brabandt <cb@256bit.org>
Date: Tue, 14 Nov 2023 21:58:26 +0100
Subject: [PATCH] patch 9.0.2111: [security]: overflow in get_number

Problem:  [security]: overflow in get_number
Solution: Return 0 when the count gets too large

[security]: overflow in get_number

When using the z= command, we may overflow the count with values larger
than MAX_INT. So verify that we do not overflow and in case when an
overflow is detected, simply return 0

Signed-off-by: Christian Brabandt <cb@256bit.org>
---
 src/misc1.c                | 2 ++
 src/testdir/test_spell.vim | 9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/src/misc1.c b/src/misc1.c
index 5b008c614a9bb..5f9828ebe9544 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -975,6 +975,8 @@ get_number(
 	c = safe_vgetc();
 	if (VIM_ISDIGIT(c))
 	{
+	    if (n > INT_MAX / 10)
+		return 0;
 	    n = n * 10 + c - '0';
 	    msg_putchar(c);
 	    ++typed;
diff --git a/src/testdir/test_spell.vim b/src/testdir/test_spell.vim
index be0bc55810f0e..1ddcd83d5117e 100644
--- a/src/testdir/test_spell.vim
+++ b/src/testdir/test_spell.vim
@@ -1077,6 +1077,15 @@ func Test_spell_compatible()
   call StopVimInTerminal(buf)
 endfunc
 
+func Test_z_equal_with_large_count()
+  split
+  set spell
+  call setline(1, "ff")
+  norm 0z=337203685477580
+  set nospell
+  bwipe!
+endfunc
+
 let g:test_data_aff1 = [
       \"SET ISO8859-1",
       \"TRY esianrtolcdugmphbyfvkwjkqxz-\xEB\xE9\xE8\xEA\xEF\xEE\xE4\xE0\xE2\xF6\xFC\xFB'ESIANRTOLCDUGMPHBYFVKWJKQXZ",