From 0a30bf0212ed32a5230ec6fe9ae20fb10e52c4e4 Mon Sep 17 00:00:00 2001
From: Dylan Conway <35280289+dylan-conway@users.noreply.github.com>
Date: Sat, 3 Dec 2022 02:59:17 -0800
Subject: [PATCH] make sure to not use incomplete characters (#1575)

---
 src/bun.js/webcore/encoding.zig | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/bun.js/webcore/encoding.zig b/src/bun.js/webcore/encoding.zig
index a3b350899c..c3444c71f1 100644
--- a/src/bun.js/webcore/encoding.zig
+++ b/src/bun.js/webcore/encoding.zig
@@ -885,7 +885,10 @@ pub const Encoder = struct {
                 return ZigString.init(input).toValueGC(global);
             },
             .ucs2, .utf16le => {
-                var output = allocator.alloc(u16, @maximum(len / 2, 1)) catch return ZigString.init("Out of memory").toErrorInstance(global);
+                // Avoid incomplete characters
+                if (len / 2 == 0) return ZigString.Empty.toValue(global);
+
+                var output = allocator.alloc(u16, len / 2) catch return ZigString.init("Out of memory").toErrorInstance(global);
                 var output_bytes = std.mem.sliceAsBytes(output);
                 output_bytes[output_bytes.len - 1] = 0;