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markt-asf pushed a commit to branch 9.0.x
in repository https://gitbox.apache.org/repos/asf/tomcat.git
The following commit(s) were added to refs/heads/9.0.x by this push:
new 008cede5bd Follow-on to "Report a parse error for SSI expressions
with..."
008cede5bd is described below
commit 008cede5bdc05b05ff30606175b4408ac8242088
Author: Mark Thomas <[email protected]>
AuthorDate: Mon Oct 19 18:45:32 2026 +0100
Follow-on to "Report a parse error for SSI expressions with..."
Reject expressions with mis-matched parenthesis
Clean-up tests
---
.../apache/catalina/ssi/ExpressionParseTree.java | 23 +++++++++++++---------
.../apache/catalina/ssi/LocalStrings.properties | 1 +
.../catalina/ssi/TestExpressionParseTree.java | 18 +++++++++--------
3 files changed, 25 insertions(+), 17 deletions(-)
diff --git a/java/org/apache/catalina/ssi/ExpressionParseTree.java
b/java/org/apache/catalina/ssi/ExpressionParseTree.java
index 7ba512c1b5..f4fd7fddb6 100644
--- a/java/org/apache/catalina/ssi/ExpressionParseTree.java
+++ b/java/org/apache/catalina/ssi/ExpressionParseTree.java
@@ -42,6 +42,10 @@ public class ExpressionParseTree {
* since it can contain {@code null}s.
*/
private final LinkedList<OppNode> oppStack = new LinkedList<>();
+ /**
+ * Contains the node stack size at the start of each group.
+ */
+ private final LinkedList<Integer> groupNodeCounts = new LinkedList<>();
/**
* The root node after the expression has been parsed.
*/
@@ -95,6 +99,7 @@ public class ExpressionParseTree {
// If node is null then it's just a group marker
if (node == null) {
oppStack.addFirst(null);
+ groupNodeCounts.addFirst(Integer.valueOf(nodeStack.size()));
return;
}
while (true) {
@@ -135,7 +140,8 @@ public class ExpressionParseTree {
* @throws ParseException The operator is missing one of its operands
*/
private void checkOperands(OppNode node, int index) throws ParseException {
- if (nodeStack.size() < node.getOperandCount()) {
+ int groupNodeCount = nodeStack.size() -
groupNodeCounts.getFirst().intValue();
+ if (groupNodeCount < node.getOperandCount()) {
throw new
ParseException(sm.getString("expressionParseTree.missingOperand"), index);
}
}
@@ -149,20 +155,15 @@ public class ExpressionParseTree {
* @throws ParseException An operator was missing one of its operands
*/
private void resolveGroup(int index) throws ParseException {
- // The stack may be empty if the expression contained more closing
- // parentheses than opening ones, which consumed the artificial group
- // marker
- while (!oppStack.isEmpty()) {
- OppNode top = oppStack.removeFirst();
- if (top == null) {
- break;
- }
+ OppNode top;
+ while ((top = oppStack.removeFirst()) != null) {
checkOperands(top, index);
// Let it fill its branches
top.popValues(nodeStack);
// Stick it on the resolved node stack
nodeStack.addFirst(top);
}
+ groupNodeCounts.removeFirst();
}
@@ -214,6 +215,10 @@ public class ExpressionParseTree {
oppStack.addFirst(new EqualNode());
break;
case ExpressionTokenizer.TOKEN_RBRACE:
+ if (groupNodeCounts.size() == 1) {
+ throw new
ParseException(sm.getString("expressionParseTree.unmatchedClosingParenthesis"),
+ et.getIndex());
+ }
// Closeout the current group
resolveGroup(et.getIndex());
break;
diff --git a/java/org/apache/catalina/ssi/LocalStrings.properties
b/java/org/apache/catalina/ssi/LocalStrings.properties
index 5969272c58..8519dbd829 100644
--- a/java/org/apache/catalina/ssi/LocalStrings.properties
+++ b/java/org/apache/catalina/ssi/LocalStrings.properties
@@ -20,6 +20,7 @@ expressionParseTree.extraNodes=Extra nodes created
expressionParseTree.invalidExpression=Invalid expression [{0}]
expressionParseTree.missingOperand=Missing operand
expressionParseTree.noNodes=No nodes created
+expressionParseTree.unmatchedClosingParenthesis=Unmatched closing parenthesis
expressionParseTree.unterminatedLiteral=Unterminated string or regular
expression
expressionParseTree.unusedOpCodes=Unused nodes exist
diff --git a/test/org/apache/catalina/ssi/TestExpressionParseTree.java
b/test/org/apache/catalina/ssi/TestExpressionParseTree.java
index 0a3cbd5bf5..522da074d8 100644
--- a/test/org/apache/catalina/ssi/TestExpressionParseTree.java
+++ b/test/org/apache/catalina/ssi/TestExpressionParseTree.java
@@ -164,7 +164,8 @@ public class TestExpressionParseTree {
for (String expression : expressions) {
SSIMediator mediator = new SSIMediator(new
TesterSSIExternalResolver(), LAST_MODIFIED);
try {
- new ExpressionParseTree(expression, mediator);
+ @SuppressWarnings("unused")
+ ExpressionParseTree unused = new
ExpressionParseTree(expression, mediator);
Assert.fail("Expected a parse error for [" + expression + "]");
} catch (ParseException pe) {
// Expected
@@ -177,11 +178,12 @@ public class TestExpressionParseTree {
public void testMissingOperand() throws Exception {
// Operators missing an operand must produce a parse error rather than
// an unchecked exception
- String[] expressions = { "= a", "a =", "a ! =", "!", "a = = b", "!= a"
};
+ String[] expressions = { "= a", "a =", "a ! =", "!", "a = = b", "!=
a", "a (!)", "a (= b)" };
for (String expression : expressions) {
SSIMediator mediator = new SSIMediator(new
TesterSSIExternalResolver(), LAST_MODIFIED);
try {
- new ExpressionParseTree(expression, mediator);
+ @SuppressWarnings("unused")
+ ExpressionParseTree unused = new
ExpressionParseTree(expression, mediator);
Assert.fail("Expected a parse error for [" + expression + "]");
} catch (ParseException pe) {
// Expected
@@ -191,16 +193,16 @@ public class TestExpressionParseTree {
@Test
- public void testExtraClosingParen() throws Exception {
- // Unbalanced closing parentheses consumed the artificial group marker
- // and used to result in a NoSuchElementException from the parser
+ public void testUnmatchedClosingParenthesis() throws Exception {
String[] expressions = { ")", "a)", "a))", "(a))", "a ) b" };
for (String expression : expressions) {
SSIMediator mediator = new SSIMediator(new
TesterSSIExternalResolver(), LAST_MODIFIED);
try {
- new ExpressionParseTree(expression, mediator);
+ @SuppressWarnings("unused")
+ ExpressionParseTree unused = new
ExpressionParseTree(expression, mediator);
+ Assert.fail("Expected a parse error for [" + expression + "]");
} catch (ParseException pe) {
- // Also a valid outcome
+ // Expected
}
}
}
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