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Posted to j-dev@xerces.apache.org by "Guangtai Liang (Reopened) (JIRA)" <xe...@xml.apache.org> on 2012/02/14 05:55:00 UTC
[jira] [Reopened] (XERCESJ-1552) An incomplete fix for the NPE bugs
in RangeToken.java
[ https://issues.apache.org/jira/browse/XERCESJ-1552?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Guangtai Liang reopened XERCESJ-1552:
-------------------------------------
Please take a look at the log message of and the fix made by the revision 928735, which showed that this.ranges should be null-checked before dereference.
Revision: 928735
Author: mrglavas
Date: 19:54:01, 2010年3月29日
Message:
Fixing a potential NPE in a debug method.
----
Modified : /xerces/java/trunk/src/org/apache/xerces/impl/xpath/regex/RangeToken.java
> An incomplete fix for the NPE bugs in RangeToken.java
> -----------------------------------------------------
>
> Key: XERCESJ-1552
> URL: https://issues.apache.org/jira/browse/XERCESJ-1552
> Project: Xerces2-J
> Issue Type: Bug
> Components: Other
> Reporter: Guangtai Liang
> Priority: Critical
> Labels: incomplete_fix, missing_fixes
>
> The fix revision 928735 was aimed to remove an NPE bug on the "this.ranges " in the method "dumpRanges" of the file "/xerces/java/trunk/src/org/apache/xerces/impl/xpath/regex/RangeToken.java" , but it is incomplete.
> Since the "this.ranges" is a class field and also could be null during the run-time execution, it should also be null-checked before being dereferenced in other methods.
> The buggy code locations the same fix needs to be applied at are as bellows:
> Lines 497 and 505 of the method "match";
> boolean match(int ch) {
> if (this.map == null) this.createMap();
> boolean ret;
> if (this.type == RANGE) {
> if (ch < MAPSIZE)
> return (this.map[ch/32] & (1<<(ch&0x1f))) != 0;
> ret = false;
> for (int i = this.nonMapIndex; i < this.ranges.length; i += 2) {
> if (this.ranges[i] <= ch && ch <= this.ranges[i+1])
> return true;
> }
> } else {
> if (ch < MAPSIZE)
> return (this.map[ch/32] & (1<<(ch&0x1f))) == 0;
> ret = true;
> for (int i = this.nonMapIndex; i < this.ranges.length; i += 2) {
> if (this.ranges[i] <= ch && ch <= this.ranges[i+1])
> return false;
> }
> }
> return ret;
> }
> Line 517 of the method "createMap".
> private void createMap() {
> int asize = MAPSIZE/32; // 32 is the number of bits in `int'.
> int [] map = new int[asize];
> int nonMapIndex = this.ranges.length;
> for (int i = 0; i < asize; ++i) {
> map[i] = 0;
> }
> for (int i = 0; i < this.ranges.length; i += 2) {
> int s = this.ranges[i];
> int e = this.ranges[i+1];
> if (s < MAPSIZE) {
> for (int j = s; j <= e && j < MAPSIZE; j++) {
> map[j/32] |= 1<<(j&0x1f); // s&0x1f : 0-31
> }
> }
> else {
> nonMapIndex = i;
> break;
> }
> if (e >= MAPSIZE) {
> nonMapIndex = i;
> break;
> }
> }
> this.map = map;
> this.nonMapIndex = nonMapIndex;
> //for (int i = 0; i < asize; i ++) System.err.println("Map: "+Integer.toString(this.map[i], 16));
> }
> Lines 557 and 580 of the method "toString":
> public String toString(int options) {
> String ret;
> if (this.type == RANGE) {
> if (this == Token.token_dot)
> ret = ".";
> else if (this == Token.token_0to9)
> ret = "\\d";
> else if (this == Token.token_wordchars)
> ret = "\\w";
> else if (this == Token.token_spaces)
> ret = "\\s";
> else {
> StringBuffer sb = new StringBuffer();
> sb.append('[');
> for (int i = 0; i < this.ranges.length; i += 2) {
> if ((options & RegularExpression.SPECIAL_COMMA) != 0 && i > 0) sb.append(',');
> if (this.ranges[i] == this.ranges[i+1]) {
> sb.append(escapeCharInCharClass(this.ranges[i]));
> } else {
> sb.append(escapeCharInCharClass(this.ranges[i]));
> sb.append((char)'-');
> sb.append(escapeCharInCharClass(this.ranges[i+1]));
> }
> }
> sb.append(']');
> ret = sb.toString();
> }
> } else {
> if (this == Token.token_not_0to9)
> ret = "\\D";
> else if (this == Token.token_not_wordchars)
> ret = "\\W";
> else if (this == Token.token_not_spaces)
> ret = "\\S";
> else {
> StringBuffer sb = new StringBuffer();
> sb.append("[^");
> for (int i = 0; i < this.ranges.length; i += 2) {
> if ((options & RegularExpression.SPECIAL_COMMA) != 0 && i > 0) sb.append(',');
> if (this.ranges[i] == this.ranges[i+1]) {
> sb.append(escapeCharInCharClass(this.ranges[i]));
> } else {
> sb.append(escapeCharInCharClass(this.ranges[i]));
> sb.append('-');
> sb.append(escapeCharInCharClass(this.ranges[i+1]));
> }
> }
> sb.append(']');
> ret = sb.toString();
> }
> }
> return ret;
> }
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