# HG changeset patch
# User Christian Brabandt <cb@256bit.org>
# Date 1524511806 -7200
# Node ID c38f293872458f7fd730fce3996c930e09ef552b
# Parent  5f94d5556daea52622ecf91d2b334447765f935a
patch 8.0.1750: crash when clearing loccation list in autocommand

commit https://github.com/vim/vim/commit/3b9474b4ad4d85b5396f7f641b436f193dc9d486
Author: Bram Moolenaar <Bram@vim.org>
Date:   Mon Apr 23 21:29:48 2018 +0200

    patch 8.0.1750: crash when clearing loccation list in autocommand

    Problem:    Crash when clearing loccation list in autocommand.
    Solution:   Check if "qi" equals "ql_info". (Yegappan Lakshmanan)

diff --git a/src/quickfix.c b/src/quickfix.c
--- a/src/quickfix.c
+++ b/src/quickfix.c
@@ -5897,7 +5897,6 @@ ex_helpgrep(exarg_T *eap)
     char_u	*lang;
 #endif
     qf_info_T	*qi = &ql_info;
-    qf_info_T	*save_qi;
     int		new_qi = FALSE;
     win_T	*wp;
     char_u	*au_name =  NULL;
@@ -5951,9 +5950,6 @@ ex_helpgrep(exarg_T *eap)
 	}
     }
 
-    /* Autocommands may change the list. Save it for later comparison */
-    save_qi = qi;
-
     regmatch.regprog = vim_regcomp(eap->arg, RE_MAGIC + RE_STRING);
     regmatch.rm_ic = FALSE;
     if (regmatch.regprog != NULL)
@@ -6086,7 +6082,7 @@ ex_helpgrep(exarg_T *eap)
     {
 	apply_autocmds(EVENT_QUICKFIXCMDPOST, au_name,
 					       curbuf->b_fname, TRUE, curbuf);
-	if (!new_qi && qi != save_qi && qf_find_buf(qi) == NULL)
+	if (!new_qi && qi != &ql_info && qf_find_buf(qi) == NULL)
 	    /* autocommands made "qi" invalid */
 	    return;
     }
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
@@ -3175,3 +3175,17 @@ func Test_vimgrep_autocmd()
   call delete('Xtest2.txt')
   call setqflist([], 'f')
 endfunc
+
+" The following test used to crash Vim
+func Test_lhelpgrep_autocmd()
+  lhelpgrep quickfix
+  autocmd QuickFixCmdPost * call setloclist(0, [], 'f')
+  lhelpgrep buffer
+  call assert_equal('help', &filetype)
+  call assert_equal(0, getloclist(0, {'nr' : '$'}).nr)
+  lhelpgrep tabpage
+  call assert_equal('help', &filetype)
+  call assert_equal(1, getloclist(0, {'nr' : '$'}).nr)
+  au! QuickFixCmdPost
+  new | only
+endfunc
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1750,
+/**/
     1749,
 /**/
     1748,