# HG changeset patch
# User Bram Moolenaar <Bram@vim.org>
# Date 1598905804 -7200
# Node ID d8065205ea82a47dad10b6e7867e109713c2794e
# Parent  023d9e265ff014885cedbc3d9d3bfc4157b53fd0
patch 8.2.1557: crash in :vimgrep when started as "vim -n"

Commit: https://github.com/vim/vim/commit/997cd1a17f030d004b334d17cf1c1c57050c9906
Author: Bram Moolenaar <Bram@vim.org>
Date:   Mon Aug 31 22:16:08 2020 +0200

    patch 8.2.1557: crash in :vimgrep when started as "vim -n"

    Problem:    Crash in :vimgrep when started as "vim -n". (Raul Segura)
    Solution:   Check mfp pointer. (Yegappan Lakshmanan, closes https://github.com/vim/vim/issues/6827)

diff --git a/src/quickfix.c b/src/quickfix.c
--- a/src/quickfix.c
+++ b/src/quickfix.c
@@ -6022,7 +6022,7 @@ vgr_process_args(
     static int
 existing_swapfile(buf_T *buf)
 {
-    if (buf->b_ml.ml_mfp != NULL)
+    if (buf->b_ml.ml_mfp != NULL && buf->b_ml.ml_mfp->mf_fname != NULL)
     {
 	char_u *fname = buf->b_ml.ml_mfp->mf_fname;
 	size_t len = STRLEN(fname);
diff --git a/src/testdir/test_quickfix.vim b/src/testdir/test_quickfix.vim
--- a/src/testdir/test_quickfix.vim
+++ b/src/testdir/test_quickfix.vim
@@ -2833,6 +2833,21 @@ func Test_vimgrep_with_no_last_search_pa
   call delete('Xresult')
 endfunc
 
+" Test vimgrep without swap file
+func Test_vimgrep_without_swap_file()
+  let lines =<< trim [SCRIPT]
+    vimgrep grep test_c*
+    call writefile(['done'], 'Xresult')
+    qall!
+  [SCRIPT]
+  call writefile(lines, 'Xscript')
+  if RunVim([], [], '--clean -n -S Xscript Xscript')
+    call assert_equal(['done'], readfile('Xresult'))
+  endif
+  call delete('Xscript')
+  call delete('Xresult')
+endfunc
+
 func Test_vimgrep_existing_swapfile()
   call writefile(['match apple with apple'], 'Xapple')
   call writefile(['swapfile'], '.Xapple.swp')
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1557,
+/**/
     1556,
 /**/
     1555,