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new 5bf2a85 Fix https://bz.apache.org/bugzilla/show_bug.cgi?id=63913 Wrap
NPEs
5bf2a85 is described below
commit 5bf2a8504f5965410e82242667b71f54912fe766
Author: Mark Thomas <ma...@apache.org>
AuthorDate: Tue Nov 12 09:11:05 2019 +0000
Fix https://bz.apache.org/bugzilla/show_bug.cgi?id=63913 Wrap NPEs
Wrap any NullPointerExceptions throw by the Inflater or Deflater used by
the PerMessageDeflate extension in an IOException so that the error can
be caught and handled by the WebSocket error handling mechanism.
---
.../tomcat/websocket/LocalStrings.properties | 1 +
.../apache/tomcat/websocket/PerMessageDeflate.java | 37 ++++++++++++++++------
.../apache/tomcat/websocket/Transformation.java | 5 ++-
.../tomcat/websocket/WsRemoteEndpointImplBase.java | 7 +++-
.../tomcat/websocket/TestPerMessageDeflate.java | 2 +-
webapps/docs/changelog.xml | 11 +++++++
6 files changed, 51 insertions(+), 12 deletions(-)
diff --git a/java/org/apache/tomcat/websocket/LocalStrings.properties
b/java/org/apache/tomcat/websocket/LocalStrings.properties
index 4f6f3b7..744619a 100644
--- a/java/org/apache/tomcat/websocket/LocalStrings.properties
+++ b/java/org/apache/tomcat/websocket/LocalStrings.properties
@@ -35,6 +35,7 @@ caseInsensitiveKeyMap.nullKey=Null keys are not permitted
futureToSendHandler.timeout=Operation timed out after waiting [{0}] [{1}] to
complete
+perMessageDeflate.alreadyClosed=The transformer has been closed and may no
longer be used
perMessageDeflate.deflateFailed=Failed to decompress a compressed WebSocket
frame
perMessageDeflate.duplicateParameter=Duplicate definition of the [{0}]
extension parameter
perMessageDeflate.invalidState=Invalid state
diff --git a/java/org/apache/tomcat/websocket/PerMessageDeflate.java
b/java/org/apache/tomcat/websocket/PerMessageDeflate.java
index 90931c5..afcfcf0 100644
--- a/java/org/apache/tomcat/websocket/PerMessageDeflate.java
+++ b/java/org/apache/tomcat/websocket/PerMessageDeflate.java
@@ -204,6 +204,8 @@ public class PerMessageDeflate implements Transformation {
dest.array(), dest.arrayOffset() + dest.position(),
dest.remaining());
} catch (DataFormatException e) {
throw new
IOException(sm.getString("perMessageDeflate.deflateFailed"), e);
+ } catch (NullPointerException e) {
+ throw new
IOException(sm.getString("perMessageDeflate.alreadyClosed"), e);
}
dest.position(dest.position() + written);
@@ -229,7 +231,11 @@ public class PerMessageDeflate implements Transformation {
} else if (written == 0) {
if (fin && (isServer && !clientContextTakeover ||
!isServer && !serverContextTakeover)) {
- inflater.reset();
+ try {
+ inflater.reset();
+ } catch (NullPointerException e) {
+ throw new
IOException(sm.getString("perMessageDeflate.alreadyClosed"), e);
+ }
}
return TransformationResult.END_OF_FRAME;
}
@@ -314,7 +320,7 @@ public class PerMessageDeflate implements Transformation {
@Override
- public List<MessagePart> sendMessagePart(List<MessagePart>
uncompressedParts) {
+ public List<MessagePart> sendMessagePart(List<MessagePart>
uncompressedParts) throws IOException {
List<MessagePart> allCompressedParts = new ArrayList<>();
for (MessagePart uncompressedPart : uncompressedParts) {
@@ -345,10 +351,14 @@ public class PerMessageDeflate implements Transformation {
while (deflateRequired) {
ByteBuffer compressedPayload = writeBuffer;
- int written = deflater.deflate(compressedPayload.array(),
- compressedPayload.arrayOffset() +
compressedPayload.position(),
- compressedPayload.remaining(), flush);
- compressedPayload.position(compressedPayload.position() +
written);
+ try {
+ int written =
deflater.deflate(compressedPayload.array(),
+ compressedPayload.arrayOffset() +
compressedPayload.position(),
+ compressedPayload.remaining(), flush);
+
compressedPayload.position(compressedPayload.position() + written);
+ } catch (NullPointerException e) {
+ throw new
IOException(sm.getString("perMessageDeflate.alreadyClosed"), e);
+ }
if (!uncompressedPart.isFin() &&
compressedPayload.hasRemaining() && deflater.needsInput()) {
// This message part has been fully processed by the
@@ -401,7 +411,12 @@ public class PerMessageDeflate implements Transformation {
// - in middle of EOM bytes
// - about to write EOM bytes
// - more data to write
- int eomBufferWritten = deflater.deflate(EOM_BUFFER, 0,
EOM_BUFFER.length, Deflater.SYNC_FLUSH);
+ int eomBufferWritten;
+ try {
+ eomBufferWritten = deflater.deflate(EOM_BUFFER, 0,
EOM_BUFFER.length, Deflater.SYNC_FLUSH);
+ } catch (NullPointerException e) {
+ throw new
IOException(sm.getString("perMessageDeflate.alreadyClosed"), e);
+ }
if (eomBufferWritten < EOM_BUFFER.length) {
// EOM has just been completed
compressedPayload.limit(compressedPayload.limit()
- EOM_BYTES.length + eomBufferWritten);
@@ -447,11 +462,15 @@ public class PerMessageDeflate implements Transformation {
}
- private void startNewMessage() {
+ private void startNewMessage() throws IOException {
firstCompressedFrameWritten = false;
emptyMessage = true;
if (isServer && !serverContextTakeover || !isServer &&
!clientContextTakeover) {
- deflater.reset();
+ try {
+ deflater.reset();
+ } catch (NullPointerException e) {
+ throw new
IOException(sm.getString("perMessageDeflate.alreadyClosed"), e);
+ }
}
}
diff --git a/java/org/apache/tomcat/websocket/Transformation.java
b/java/org/apache/tomcat/websocket/Transformation.java
index 5186181..14d8093 100644
--- a/java/org/apache/tomcat/websocket/Transformation.java
+++ b/java/org/apache/tomcat/websocket/Transformation.java
@@ -101,8 +101,11 @@ public interface Transformation {
* @return The list of messages after this any any subsequent
* transformations have been applied. The size of the returned
list
* may be bigger or smaller than the size of the input list
+ *
+ * @throws IOException If an error occurs during the transformation of the
+ * message parts
*/
- List<MessagePart> sendMessagePart(List<MessagePart> messageParts);
+ List<MessagePart> sendMessagePart(List<MessagePart> messageParts) throws
IOException;
/**
* Clean-up any resources that were used by the transformation.
diff --git a/java/org/apache/tomcat/websocket/WsRemoteEndpointImplBase.java
b/java/org/apache/tomcat/websocket/WsRemoteEndpointImplBase.java
index de6bf72..f022132 100644
--- a/java/org/apache/tomcat/websocket/WsRemoteEndpointImplBase.java
+++ b/java/org/apache/tomcat/websocket/WsRemoteEndpointImplBase.java
@@ -338,7 +338,12 @@ public abstract class WsRemoteEndpointImplBase implements
RemoteEndpoint {
intermediateMessageHandler,
new EndMessageHandler(this, handler), -1));
- messageParts = transformation.sendMessagePart(messageParts);
+ try {
+ messageParts = transformation.sendMessagePart(messageParts);
+ } catch (IOException ioe) {
+ handler.onResult(new SendResult(ioe));
+ return;
+ }
// Some extensions/transformations may buffer messages so it is
possible
// that no message parts will be returned. If this is the case the
diff --git a/test/org/apache/tomcat/websocket/TestPerMessageDeflate.java
b/test/org/apache/tomcat/websocket/TestPerMessageDeflate.java
index 7d883e1..9139460 100644
--- a/test/org/apache/tomcat/websocket/TestPerMessageDeflate.java
+++ b/test/org/apache/tomcat/websocket/TestPerMessageDeflate.java
@@ -34,7 +34,7 @@ public class TestPerMessageDeflate {
* https://bz.apache.org/bugzilla/show_bug.cgi?id=61491
*/
@Test
- public void testSendEmptyMessagePartWithContextTakeover() {
+ public void testSendEmptyMessagePartWithContextTakeover() throws
IOException {
// Set up the extension using defaults
List<Parameter> parameters = Collections.emptyList();
diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
index efe9306..8a19840 100644
--- a/webapps/docs/changelog.xml
+++ b/webapps/docs/changelog.xml
@@ -157,6 +157,17 @@
</fix>
</changelog>
</subsection>
+ <subsection name="WebSocket">
+ <changelog>
+ <fix>
+ <bug>63913</bug>: Wrap any <code>NullPointerException</code>s throw by
+ the <code>Inflater</code> or <code>Deflater</code> used by the
+ <code>PerMessageDeflate</code> extension in an <code>IOException</code>
+ so that the error can be caught and handled by the WebSocket error
+ handling mechanism. (markt)
+ </fix>
+ </changelog>
+ </subsection>
<subsection name="Web applications">
<changelog>
<fix>
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