In utf16_to_utf8(), fix off-by-one errors for the range of valid surrogates.

Both high ends were one too low.

1 files changed, 2 insertions, 2 deletions

diff --git a/utf8.c b/utf8.c
index 3e4451b10a..3de02ed4f3 100644
--- a/utf8.c
+++ b/utf8.c
@@ -985,13 +985,13 @@ Perl_utf16_to_utf8(pTHX_ U8* p, U8* d, I32 bytelen, I32 *newlen)
 	    *d++ = (U8)(( uv        & 0x3f) | 0x80);
 	    continue;
 	}
-	if (uv >= 0xd800 && uv < 0xdbff) {	/* surrogates */
+	if (uv >= 0xd800 && uv <= 0xdbff) {	/* surrogates */
 	    if (p >= pend) {
 		Perl_croak(aTHX_ "Malformed UTF-16 surrogate");
 	    } else {
 		UV low = (p[0] << 8) + p[1];
 		p += 2;
-		if (low < 0xdc00 || low >= 0xdfff)
+		if (low < 0xdc00 || low > 0xdfff)
 		    Perl_croak(aTHX_ "Malformed UTF-16 surrogate");
 		uv = ((uv - 0xd800) << 10) + (low - 0xdc00) + 0x10000;
 	    }