From 1670fe1c0009dc2da785c0da2cc684b07dfe568c Mon Sep 17 00:00:00 2001
From: Arseny Kapoulkine <arseny.kapoulkine@gmail.com>
Date: Fri, 26 Jul 2019 22:27:31 -0700
Subject: [PATCH] Fix memcpy with overlapping regions

When moving the unprocessed line to the beginning of the buffer, in rare
edge cases where the unprocessed chunk is larger than the processed
chunks (which means the lines are very long), the source & target range
will overlap. This is undefined as per C standard and triggers ubsan
errors.

Fix this by using memmove.
---
 fast_obj.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fast_obj.h b/fast_obj.h
index 8b12086..bd09b7d 100644
--- a/fast_obj.h
+++ b/fast_obj.h
@@ -1367,7 +1367,7 @@ fastObjMesh* fast_obj_read(const char* path)
 
         /* Copy overflow for next buffer */
         bytes = (unsigned int)(end - last);
-        memcpy(buffer, last, bytes);
+        memmove(buffer, last, bytes);
         start = buffer + bytes;
     }