From 65abd4e92af497bbe1ae1085fa16b1b811a3c652 Mon Sep 17 00:00:00 2001
From: Valentin <vakevk+git@gmail.com>
Date: Sun, 30 Aug 2020 11:13:19 +0200
Subject: [PATCH] Fix undefined behavior

Without the casts the bytes accesses get converted to int. but int is
not guaranteed to be 4 bytes large. Even when it is 4 bytes large
`bytes[3] << 24` does not fit because int is signed.
---
 xcursor/xcursor.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/xcursor/xcursor.c b/xcursor/xcursor.c
index aabef4837..51ce83237 100644
--- a/xcursor/xcursor.c
+++ b/xcursor/xcursor.c
@@ -285,11 +285,12 @@ _XcursorReadUInt (XcursorFile *file, XcursorUInt *u)
         return XcursorFalse;
 
     if ((*file->read) (file, bytes, 4) != 4)
-	return XcursorFalse;
-    *u = ((bytes[0] << 0) |
-	  (bytes[1] << 8) |
-	  (bytes[2] << 16) |
-	  (bytes[3] << 24));
+        return XcursorFalse;
+
+    *u = ((XcursorUInt)(bytes[0]) << 0) |
+         ((XcursorUInt)(bytes[1]) << 8) |
+         ((XcursorUInt)(bytes[2]) << 16) |
+         ((XcursorUInt)(bytes[3]) << 24);
     return XcursorTrue;
 }