From b62cc36a600e2e1e5a1d1d484fef89898c847c4c Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Sat, 3 Sep 2016 16:43:53 +0200
Subject: [PATCH] patch 7.4.2313 Problem:    Crash when deleting an augroup and
 listing an autocommand.             (Dominique Pelle) Solution:   Make sure
 deleted_augroup is valid.

---
 src/fileio.c                 | 23 +++++++++++++++--------
 src/testdir/test_autocmd.vim |  9 +++++++++
 src/version.c                |  2 ++
 3 files changed, 26 insertions(+), 8 deletions(-)

diff --git a/src/fileio.c b/src/fileio.c
index 6bf54526a..6d5ed19d1 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -7758,6 +7758,7 @@ static AutoPatCmd *active_apc_list = NULL; /* stack of active autocommands */
  */
 static garray_T augroups = {0, 0, sizeof(char_u *), 10, NULL};
 #define AUGROUP_NAME(i) (((char_u **)augroups.ga_data)[i])
+/* use get_deleted_augroup() to get this */
 static char_u *deleted_augroup = NULL;
 
 /*
@@ -7790,6 +7791,14 @@ static event_T	last_event;
 static int	last_group;
 static int	autocmd_blocked = 0;	/* block all autocmds */
 
+    static char_u *
+get_deleted_augroup(void)
+{
+    if (deleted_augroup == NULL)
+	deleted_augroup = (char_u *)_("--Deleted--");
+    return deleted_augroup;
+}
+
 /*
  * Show the autocommands for one AutoPat.
  */
@@ -7813,7 +7822,7 @@ show_autocmd(AutoPat *ap, event_T event)
 	if (ap->group != AUGROUP_DEFAULT)
 	{
 	    if (AUGROUP_NAME(ap->group) == NULL)
-		msg_puts_attr(deleted_augroup, hl_attr(HLF_E));
+		msg_puts_attr(get_deleted_augroup(), hl_attr(HLF_E));
 	    else
 		msg_puts_attr(AUGROUP_NAME(ap->group), hl_attr(HLF_T));
 	    msg_puts((char_u *)"  ");
@@ -8029,9 +8038,7 @@ au_del_group(char_u *name)
 	vim_free(AUGROUP_NAME(i));
 	if (in_use)
 	{
-	    if (deleted_augroup == NULL)
-		deleted_augroup = (char_u *)_("--Deleted--");
-	    AUGROUP_NAME(i) = deleted_augroup;
+	    AUGROUP_NAME(i) = get_deleted_augroup();
 	}
 	else
 	    AUGROUP_NAME(i) = NULL;
@@ -8048,7 +8055,7 @@ au_find_group(char_u *name)
     int	    i;
 
     for (i = 0; i < augroups.ga_len; ++i)
-	if (AUGROUP_NAME(i) != NULL && AUGROUP_NAME(i) != deleted_augroup
+	if (AUGROUP_NAME(i) != NULL && AUGROUP_NAME(i) != get_deleted_augroup()
 		&& STRCMP(AUGROUP_NAME(i), name) == 0)
 	    return i;
     return AUGROUP_ERROR;
@@ -8116,7 +8123,7 @@ free_all_autocmds(void)
     for (i = 0; i < augroups.ga_len; ++i)
     {
 	s = ((char_u **)(augroups.ga_data))[i];
-	if (s != deleted_augroup)
+	if (s != get_deleted_augroup())
 	    vim_free(s);
     }
     ga_clear(&augroups);
@@ -9865,7 +9872,7 @@ get_augroup_name(expand_T *xp UNUSED, int idx)
 	return (char_u *)"END";
     if (idx >= augroups.ga_len)		/* end of list */
 	return NULL;
-    if (AUGROUP_NAME(idx) == NULL || AUGROUP_NAME(idx) == deleted_augroup)
+    if (AUGROUP_NAME(idx) == NULL || AUGROUP_NAME(idx) == get_deleted_augroup())
 	/* skip deleted entries */
 	return (char_u *)"";
     return AUGROUP_NAME(idx);		/* return a name */
@@ -9931,7 +9938,7 @@ get_event_name(expand_T *xp UNUSED, int idx)
     if (idx < augroups.ga_len)		/* First list group names, if wanted */
     {
 	if (!include_groups || AUGROUP_NAME(idx) == NULL
-				       || AUGROUP_NAME(idx) == deleted_augroup)
+				 || AUGROUP_NAME(idx) == get_deleted_augroup())
 	    return (char_u *)"";	/* skip deleted entries */
 	return AUGROUP_NAME(idx);	/* return a name */
     }
diff --git a/src/testdir/test_autocmd.vim b/src/testdir/test_autocmd.vim
index 6db3bf76d..7d786c88c 100644
--- a/src/testdir/test_autocmd.vim
+++ b/src/testdir/test_autocmd.vim
@@ -183,3 +183,12 @@ func Test_augroup_warning()
   redir END
   call assert_true(match(res, "W19:") < 0)
 endfunc
+
+func Test_augroup_deleted()
+  " This caused a crash
+  augroup x
+  augroup! x
+  au VimEnter * echo
+  au VimEnter
+endfunc
+
diff --git a/src/version.c b/src/version.c
index df1de63e0..8c10a9413 100644
--- a/src/version.c
+++ b/src/version.c
@@ -763,6 +763,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2313,
 /**/
     2312,
 /**/
-- 
2.50.1