From 08737b19f8be614e48e6f8877b076ff05ad98646 Mon Sep 17 00:00:00 2001
From: avl <avl>
Date: Thu, 2 Mar 2017 15:24:52 +0000
Subject: restrictions on array index confined to lhs.

---
 generic/tclCompExpr.c |  2 +-
 generic/tclParse.c    | 12 +++++++-----
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/generic/tclCompExpr.c b/generic/tclCompExpr.c
index 6453d24..9cff125 100644
--- a/generic/tclCompExpr.c
+++ b/generic/tclCompExpr.c
@@ -746,7 +746,7 @@ ParseExpr(
 		    const char *varend;
 		    const char *varstart = &start[TclParseAllWhiteSpace(start, numBytes)];
 		    int code, len;
-		    code = Tcl_ParseVarName(NULL, varstart, numBytes, &vparse, 0);
+		    code = Tcl_ParseVarName(NULL, varstart, numBytes, &vparse, -1);
 		    len = vparse.tokenPtr[0].size;
 		    varend = varstart+len;
 		    Tcl_FreeParse(&vparse);
diff --git a/generic/tclParse.c b/generic/tclParse.c
index 425b43f..7a3c55e 100644
--- a/generic/tclParse.c
+++ b/generic/tclParse.c
@@ -1357,10 +1357,11 @@ Tcl_ParseVarName(
 				 * first null character. */
     Tcl_Parse *parsePtr,	/* Structure to fill in with information about
 				 * the variable name. */
-    int append)			/* Non-zero means append tokens to existing
+    int append)			/* greater-zero means append tokens to existing
 				 * information in parsePtr; zero means ignore
-				 * existing tokens in parsePtr and
-				 * reinitialize it. */
+				 * existing tokens in parsePtr and reinitialize
+				 * it. less-zero means being strict and disallow
+				 * un-escaped quotes, braces or open parens. */
 {
     Tcl_Token *tokenPtr;
     register const char *src;
@@ -1374,7 +1375,7 @@ Tcl_ParseVarName(
 	numBytes = strlen(start);
     }
 
-    if (!append) {
+    if (append <= 0) {
 	TclParseInit(interp, start, numBytes, parsePtr);
     }
 
@@ -1486,7 +1487,8 @@ Tcl_ParseVarName(
 	     * any number of substitutions.
 	     */
 
-	    if (TCL_OK != TclParseTokens(src+1, numBytes-1, TYPE_BAD_ARRAY_INDEX,
+            int endFlag = (append<0) ? TYPE_BAD_ARRAY_INDEX : TYPE_CLOSE_PAREN;
+	    if (TCL_OK != TclParseTokens(src+1, numBytes-1, endFlag,
 		    TCL_SUBST_ALL, parsePtr)) {
 		goto error;
 	    }
-- 
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