fs: fix WTF-8 decoding issue

We forgot to mask off the high bits from the first byte, so we ended up always failing the subsequent range check. Refs: libuv#297 Fixes: nodejs/node#48673
vtjnash · Jul 12, 2023 · 278e09f · 278e09f
1 parent 2f87d5c
commit 278e09f
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/win/fs.c b/src/win/fs.c
@@ -176,9 +176,11 @@ static int32_t fs__decode_wtf8_char(const char** input) {
   if ((b4 & 0xC0) != 0x80)
     return -1; /* invalid: not a continuation byte */
   code_point = (code_point << 6) | (b4 & 0x3F);
-  if (b1 <= 0xF4)
+  if (b1 <= 0xF4) {
+    code_point &= 0x1FFFFF;
     if (code_point <= 0x10FFFF)
       return code_point; /* four-byte character */
+  }
 
   /* code point too large */
   return -1;