From 10eb89d1141dc528806b32401e408e36fb2f3bf5 Mon Sep 17 00:00:00 2001
From: Roberto I <roberto@inf.puc-rio.br>
Date: Wed, 18 Feb 2026 13:24:04 -0300
Subject: BUG: shift overflow in utf-8 decode

An initial byte \xFF will ask for 7 continuation bytes, and then the
shift by (count * 5) will try to shift 35 bits.
---
 makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'makefile')

diff --git a/makefile b/makefile
index 8674519f..fa165bca 100644
--- a/makefile
+++ b/makefile
@@ -60,7 +60,7 @@ CWARNS= $(CWARNSCPP) $(CWARNSC) $(CWARNGCC)
 # create problems; some are only available in newer gcc versions. To
 # use some of them, we also have to define an environment variable
 # ASAN_OPTIONS="detect_invalid_pointer_pairs=2".
-# -fsanitize=undefined
+# -fsanitize=undefined  (you may need to add "-lubsan" to libs)
 # -fsanitize=pointer-subtract -fsanitize=address -fsanitize=pointer-compare
 # TESTS= -DLUA_USER_H='"ltests.h"' -Og -g
 
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