From 63bb7198dfded8a5c37195ebc8503516a1eda0f3 Mon Sep 17 00:00:00 2001
From: ckelsel <ckelsel@hotmail.com>
Date: Mon, 15 Jan 2018 19:27:10 +0800
Subject: [PATCH] vim-patch:8.0.0398: illegal memory access with "t"

Problem:    Illegal memory access with "t".
Solution:   Use strncmp() instead of memcmp(). (Dominique Pelle, closes vim/vim#1528)

https://github.com/vim/vim/commit/66727e16079fbac6db3897b5c3736ec9fba995bb
---
 src/nvim/search.c                | 8 ++++----
 src/nvim/testdir/test_search.vim | 7 +++++++
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/nvim/search.c b/src/nvim/search.c
index 1eb1a25a19..0a266382ec 100644
--- a/src/nvim/search.c
+++ b/src/nvim/search.c
@@ -1382,13 +1382,13 @@ int searchc(cmdarg_T *cap, int t_cmd)
           col -= (*mb_head_off)(p, p + col - 1) + 1;
         }
         if (lastc_bytelen == 1) {
-          if (p[col] == c && stop)
+          if (p[col] == c && stop) {
             break;
-        } else {
-          if (memcmp(p + col, lastc_bytes, lastc_bytelen) == 0 && stop)
+          }
+        } else if (STRNCMP(p + col, lastc_bytes, lastc_bytelen) == 0 && stop) {
             break;
         }
-        stop = TRUE;
+        stop = true;
       }
     } else {
       for (;; ) {
diff --git a/src/nvim/testdir/test_search.vim b/src/nvim/testdir/test_search.vim
index a333e7f206..03112df46f 100644
--- a/src/nvim/testdir/test_search.vim
+++ b/src/nvim/testdir/test_search.vim
@@ -298,3 +298,10 @@ func Test_searchpair()
   q!
 endfunc
 
+func Test_searchc()
+  " These commands used to cause memory overflow in searchc().
+  new
+  norm ixx
+  exe "norm 0t\u93cf"
+  bw!
+endfunc