From: Bram Moolenaar <Bram@vim.org>
Date: Mon, 4 Oct 2021 18:47:35 +0000 (+0100)
Subject: patch 8.2.3471: crash when using CTRL-T after an empty search pattern
X-Git-Tag: v8.2.3471
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=d8d957de86f218de9124ca1209548f8c6f61b69b;p=vim

patch 8.2.3471: crash when using CTRL-T after an empty search pattern

Problem:    Crash when using CTRL-T after an empty search pattern.
Solution:   Bail out when there is no previous search pattern. (closes #8953)
---

diff --git a/src/ex_getln.c b/src/ex_getln.c
index a49fa05eb..07eac9086 100644
--- a/src/ex_getln.c
+++ b/src/ex_getln.c
@@ -612,7 +612,8 @@ may_adjust_incsearch_highlighting(
     // NOTE: must call restore_last_search_pattern() before returning!
     save_last_search_pattern();
 
-    if (!do_incsearch_highlighting(firstc, &search_delim, is_state, &skiplen, &patlen))
+    if (!do_incsearch_highlighting(firstc, &search_delim, is_state,
+							    &skiplen, &patlen))
     {
 	restore_last_search_pattern();
 	return OK;
@@ -626,6 +627,11 @@ may_adjust_incsearch_highlighting(
     if (search_delim == ccline.cmdbuff[skiplen])
     {
 	pat = last_search_pattern();
+	if (pat == NULL)
+	{
+	    restore_last_search_pattern();
+	    return FAIL;
+	}
 	skiplen = 0;
 	patlen = (int)STRLEN(pat);
     }
diff --git a/src/testdir/test_search.vim b/src/testdir/test_search.vim
index dd47f4f4e..bc2b3ad7b 100644
--- a/src/testdir/test_search.vim
+++ b/src/testdir/test_search.vim
@@ -1977,4 +1977,14 @@ func Test_pattern_is_uppercase_smartcase()
   bw!
 endfunc
 
+func Test_no_last_search_pattern()
+  CheckOption incsearch
+
+  let @/ = ""
+  set incsearch
+  " this was causing a crash
+  call feedkeys("//\x14", 'xt')
+endfunc
+
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index 23b0c3682..b540523b4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -757,6 +757,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3471,
 /**/
     3470,
 /**/