commit bd228fd097b41a798f90944b5d1245eddd484142
author Bram Moolenaar <Bram@vim.org> Thu Nov 25 10:50:12 2021 +0000
committer Bram Moolenaar <Bram@vim.org> Thu Nov 25 10:50:12 2021 +0000
tree ed9a086f58a1ce7dc970be1fc3495fd278dd4936
parent bb277fd89fd7c665d51be2a08993732d46c208ef

patch 8.2.3669: buffer overflow with long help argument

Problem:    Buffer overflow with long help argument.
Solution:   Use snprintf().

src/testdir/test_help.vim

diff --git a/src/testdir/test_help.vim b/src/testdir/test_help.vim
index 15cc642..6e32edd 100644
--- a/src/testdir/test_help.vim
+++ b/src/testdir/test_help.vim
@@ -134,4 +134,13 @@
   close
 endfunc
 
+func Test_help_long_argument()
+  try
+    exe 'help \%' .. repeat('0', 1021)
+  catch
+    call assert_match("E149:", v:exception)
+  endtry
+endfunc
+
+
 " vim: shiftwidth=2 sts=2 expandtab