From 889943e2bd5668335649b064b10b70a15c17c189 Mon Sep 17 00:00:00 2001
From: Andreas Schwab <schwab@linux-m68k.org>
Date: Fri, 15 Jul 2022 17:24:19 +0200
Subject: [PATCH] Fix ASAN error with fringe bitmap on NS

* src/nsterm.m (ns_define_fringe_bitmap): Correctly access fringe
bitmap data.  (Bug#56553)
---
 src/nsterm.m | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/src/nsterm.m b/src/nsterm.m
index 582bc9f6a2d..57f1f44de26 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -2900,10 +2900,7 @@ ns_define_fringe_bitmap (int which, unsigned short *bits, int h, int w)
   for (int y = 0 ; y < h ; y++)
     for (int x = 0 ; x < w ; x++)
       {
-        /* XBM rows are always round numbers of bytes, with any unused
-           bits ignored.  */
-        int byte = y * (w/8 + (w%8 ? 1 : 0)) + x/8;
-        bool bit = bits[byte] & (0x80 >> x%8);
+        bool bit = bits[y] & (1 << (w - x - 1));
         if (bit)
           [p appendBezierPathWithRect:NSMakeRect (x, y, 1, 1)];
       }
-- 
2.39.2