From 43a8242cd538ebdb838007dc3d303a37e2bc9944 Mon Sep 17 00:00:00 2001
From: Jan Edmund Lazo <jan.lazo@mail.utoronto.ca>
Date: Fri, 9 Aug 2019 18:21:52 -0400
Subject: vim-patch:8.1.1458: crash when using gtags #10704

Problem:    Crash when using gtags. (issue vim/vim#4102)
Solution:   Check for negative row or col in screen_puts_len(). (Christian
            Brabandt)
https://github.com/vim/vim/commit/0b4c9eddb5752d46b65d16e42230b1228f230f40
---
 src/nvim/screen.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/nvim/screen.c b/src/nvim/screen.c
index fb019a4d2d..e2dee154df 100644
--- a/src/nvim/screen.c
+++ b/src/nvim/screen.c
@@ -5372,8 +5372,11 @@ void grid_puts_len(ScreenGrid *grid, char_u *text, int textlen, int row,
 
   screen_adjust_grid(&grid, &row, &col);
 
-  // safety check
-  if (grid->chars == NULL || row >= grid->Rows || col >= grid->Columns) {
+  // Safety check. The check for negative row and column is to fix issue
+  // vim/vim#4102. TODO: find out why row/col could be negative.
+  if (grid->chars == NULL
+      || row >= grid->Rows || row < 0
+      || col >= grid->Columns || col < 0) {
     return;
   }
 
-- 
cgit