diff --git a/Objects/stringlib/codecs.h b/Objects/stringlib/codecs.h
index 8645bc2..d6f2b98 100644
--- a/Objects/stringlib/codecs.h
+++ b/Objects/stringlib/codecs.h
@@ -207,7 +207,7 @@
                     goto InvalidContinuation1;
             } else if (ch == 0xF4 && ch2 >= 0x90) {
                 /* invalid sequence
-                   \xF4\x90\x80\80- -- 110000- overflow */
+                   \xF4\x90\x80\x80- -- 110000- overflow */
                 goto InvalidContinuation1;
             }
             if (!IS_CONTINUATION_BYTE(ch3)) {
@@ -573,10 +573,10 @@
         }
 
         /* UTF-16 code pair: */
-        if (q >= e)
-            goto UnexpectedEnd;
         if (!Py_UNICODE_IS_HIGH_SURROGATE(ch))
             goto IllegalEncoding;
+        if (q >= e)
+            goto UnexpectedEnd;
         ch2 = (q[ihi] << 8) | q[ilo];
         q += 2;
         if (!Py_UNICODE_IS_LOW_SURROGATE(ch2))
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 6ec4127..132f57a 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -4937,11 +4937,15 @@
             endinpos = startinpos + 1;
             break;
         case 2:
-        case 3:
-        case 4:
-            if (s == end || consumed) {
+            if (consumed && (unsigned char)s[0] == 0xED && end - s == 2
+                && (unsigned char)s[1] >= 0xA0 && (unsigned char)s[1] <= 0xBF)
+            {
+                /* Truncated surrogate code in range D800-DFFF */
                 goto End;
             }
+            /* fall through */
+        case 3:
+        case 4:
             errmsg = "invalid continuation byte";
             startinpos = s - starts;
             endinpos = startinpos + ch - 1;