Backport from trunk r52223:

Bug #1572832: fix a bug in ISO-2022 codecs which may cause segfault
when encoding non-BMP unicode characters.  (Submitted by Ray Chason)

Lib/test/test_multibytecodec.py

@@ -208,6 +208,16 @@ class Test_ISO2022(unittest.TestCase):
             e = u'\u3406'.encode(encoding)
             self.failIf(filter(lambda x: x >= '\x80', e))
 
+    def test_bug1572832(self):
+        if sys.maxunicode >= 0x10000:
+            myunichr = unichr
+        else:
+            myunichr = lambda x: unichr(0xD7C0+(x>>10)) + unichr(0xDC00+(x&0x3FF))
+
+        for x in xrange(0x10000, 0x110000):
+            # Any ISO 2022 codec will cause the segfault
+            myunichr(x).encode('iso_2022_jp', 'ignore')
+
 def test_main():
     suite = unittest.TestSuite()
     suite.addTest(unittest.makeSuite(Test_MultibyteCodec))

Misc/NEWS

@@ -49,6 +49,9 @@ Core and builtins
 Extension Modules
 -----------------
 
+- Bug #1572832: fix a bug in ISO-2022 codecs which may cause segfault
+  when encoding non-BMP unicode characters.
+
 - Bug #1556784: allow format strings longer than 127 characters in
   datetime's strftime function.
 

Modules/cjkcodecs/_codecs_iso2022.c

@@ -592,9 +592,11 @@ ksx1001_encoder(const ucs4_t *data, Py_ssize_t *length)
 {
 	DBCHAR coded;
 	assert(*length == 1);
-	TRYMAP_ENC(cp949, coded, *data)
-		if (!(coded & 0x8000))
-			return coded;
+	if (*data < 0x10000) {
+		TRYMAP_ENC(cp949, coded, *data)
+			if (!(coded & 0x8000))
+				return coded;
+	}
 	return MAP_UNMAPPABLE;
 }
 
@@ -628,11 +630,13 @@ jisx0208_encoder(const ucs4_t *data, Py_ssize_t *length)
 {
 	DBCHAR coded;
 	assert(*length == 1);
-	if (*data == 0xff3c) /* F/W REVERSE SOLIDUS */
-		return 0x2140;
-	else TRYMAP_ENC(jisxcommon, coded, *data) {
-		if (!(coded & 0x8000))
-			return coded;
+	if (*data < 0x10000) {
+		if (*data == 0xff3c) /* F/W REVERSE SOLIDUS */
+			return 0x2140;
+		else TRYMAP_ENC(jisxcommon, coded, *data) {
+			if (!(coded & 0x8000))
+				return coded;
+		}
 	}
 	return MAP_UNMAPPABLE;
 }
@@ -665,9 +669,11 @@ jisx0212_encoder(const ucs4_t *data, Py_ssize_t *length)
 {
 	DBCHAR coded;
 	assert(*length == 1);
-	TRYMAP_ENC(jisxcommon, coded, *data) {
-		if (coded & 0x8000)
-			return coded & 0x7fff;
+	if (*data < 0x10000) {
+		TRYMAP_ENC(jisxcommon, coded, *data) {
+			if (coded & 0x8000)
+				return coded & 0x7fff;
+		}
 	}
 	return MAP_UNMAPPABLE;
 }
@@ -970,9 +976,11 @@ gb2312_encoder(const ucs4_t *data, Py_ssize_t *length)
 {
 	DBCHAR coded;
 	assert(*length == 1);
-	TRYMAP_ENC(gbcommon, coded, *data) {
-		if (!(coded & 0x8000))
-			return coded;
+	if (*data < 0x10000) {
+		TRYMAP_ENC(gbcommon, coded, *data) {
+			if (!(coded & 0x8000))
+				return coded;
+		}
 	}
 	return MAP_UNMAPPABLE;
 }