From fcd399d49aee6b08b44aa50882a78c8d104c5e59 Mon Sep 17 00:00:00 2001
From: "jan.nijtmans" <nijtmans@users.sourceforge.net>
Date: Wed, 31 May 2017 12:05:45 +0000
Subject: Fix [67aa9a207037ae67f9014b544c3db34fa732f2dc|67aa9a2070]: Security:
 Invalid UTF-8 can inject unexpected characters

---
 generic/tclUtf.c    | 12 +++++++++---
 tests/encoding.test | 25 +++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 3 deletions(-)

diff --git a/generic/tclUtf.c b/generic/tclUtf.c
index 68119a4..fe47f0b 100644
--- a/generic/tclUtf.c
+++ b/generic/tclUtf.c
@@ -298,7 +298,9 @@ Tcl_UtfToUniChar(
 	     */
 
 	    *chPtr = (Tcl_UniChar) (((byte & 0x1F) << 6) | (src[1] & 0x3F));
-	    return 2;
+	    if ((*chPtr == 0) || (*chPtr > 0x7f)) {
+		return 2;
+	    }
 	}
 
 	/*
@@ -313,7 +315,9 @@ Tcl_UtfToUniChar(
 
 	    *chPtr = (Tcl_UniChar) (((byte & 0x0F) << 12)
 		    | ((src[1] & 0x3F) << 6) | (src[2] & 0x3F));
-	    return 3;
+	    if (*chPtr > 0x7ff) {
+		return 3;
+	    }
 	}
 
 	/*
@@ -330,7 +334,9 @@ Tcl_UtfToUniChar(
 
 	    *chPtr = (Tcl_UniChar) (((byte & 0x0E) << 18) | ((src[1] & 0x3F) << 12)
 		    | ((src[2] & 0x3F) << 6) | (src[3] & 0x3F));
-	    return 4;
+	    if ((*chPtr <= 0x10ffff) && (*chPtr > 0xffff)) {
+		return 4;
+	    }
 	}
 
 	/*
diff --git a/tests/encoding.test b/tests/encoding.test
index 0374e2d..1d8bae5 100644
--- a/tests/encoding.test
+++ b/tests/encoding.test
@@ -448,6 +448,31 @@ test encoding-24.3 {EscapeFreeProc on open channels} {stdio} {
     list $count [viewable $line]
 } [list 3 "\u4e4e\u4e5e\u4e5f (\\u4e4e\\u4e5e\\u4e5f)"]
 
+test encoding-24.4 {Parse valid or invalid utf-8} {
+    string length [encoding convertfrom utf-8 "\xc0\x80"]
+} 1
+test encoding-24.5 {Parse valid or invalid utf-8} {
+    string length [encoding convertfrom utf-8 "\xc0\x81"]
+} 2
+test encoding-24.6 {Parse valid or invalid utf-8} {
+    string length [encoding convertfrom utf-8 "\xc1\xbf"]
+} 2
+test encoding-24.7 {Parse valid or invalid utf-8} {
+    string length [encoding convertfrom utf-8 "\xc2\x80"]
+} 1
+test encoding-24.8 {Parse valid or invalid utf-8} {
+    string length [encoding convertfrom utf-8 "\xe0\x80\x80"]
+} 3
+test encoding-24.9 {Parse valid or invalid utf-8} {
+    string length [encoding convertfrom utf-8 "\xe0\x9f\xbf"]
+} 3
+test encoding-24.10 {Parse valid or invalid utf-8} {
+    string length [encoding convertfrom utf-8 "\xe0\xa0\x80"]
+} 1
+test encoding-24.10 {Parse valid or invalid utf-8} {
+    string length [encoding convertfrom utf-8 "\xef\xbf\xbf"]
+} 1
+
 file delete [file join [temporaryDirectory] iso2022.txt]
 
 #
-- 
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