From 40ae788c2e64d018b4e58cd4210bb96434d0100d Mon Sep 17 00:00:00 2001
From: Mark Thomas <markt@apache.org>
Date: Tue, 18 Mar 2025 12:24:09 +0000
Subject: [PATCH] Fix BZ 69614 - invalid priority field values should be
 ignored

Origin: https://github.com/apache/tomcat/commit/40ae788c2e64d018b4e58cd4210bb96434d0100d

---
 java/org/apache/coyote/http2/Http2Parser.java | 23 +++++++++++------
 .../coyote/http2/LocalStrings.properties      |  1 +
 test/org/apache/coyote/http2/TestRfc9218.java | 25 +++++++++++++++++++
 4 files changed, 46 insertions(+), 7 deletions(-)

diff --git a/java/org/apache/coyote/http2/Http2Parser.java b/java/org/apache/coyote/http2/Http2Parser.java
index db7c2fd496a2..90c1142616b7 100644
--- a/java/org/apache/coyote/http2/Http2Parser.java
+++ b/java/org/apache/coyote/http2/Http2Parser.java
@@ -477,15 +477,24 @@ protected void readPriorityUpdateFrame(int payloadSize, ByteBuffer buffer) throw
 
         ByteArrayInputStream bais = new ByteArrayInputStream(payload, 4, payloadSize - 4);
         Reader r = new BufferedReader(new InputStreamReader(bais, StandardCharsets.US_ASCII));
-        Priority p = Priority.parsePriority(r);
 
-        if (log.isTraceEnabled()) {
-            log.trace(sm.getString("http2Parser.processFramePriorityUpdate.debug", connectionId,
-                    Integer.toString(prioritizedStreamID), Integer.toString(p.getUrgency()),
-                    Boolean.valueOf(p.getIncremental())));
-        }
+        try {
+            Priority p = Priority.parsePriority(r);
 
-        output.priorityUpdate(prioritizedStreamID, p);
+            if (log.isTraceEnabled()) {
+                log.trace(sm.getString("http2Parser.processFramePriorityUpdate.debug", connectionId,
+                        Integer.toString(prioritizedStreamID), Integer.toString(p.getUrgency()),
+                        Boolean.valueOf(p.getIncremental())));
+            }
+
+            output.priorityUpdate(prioritizedStreamID, p);
+        } catch (IllegalArgumentException iae) {
+            // Priority frames with invalid priority field values should be ignored
+            if (log.isTraceEnabled()) {
+                log.trace(sm.getString("http2Parser.processFramePriorityUpdate.invalid", connectionId,
+                        Integer.toString(prioritizedStreamID)), iae);
+            }
+        }
     }
 
 
diff --git a/java/org/apache/coyote/http2/LocalStrings.properties b/java/org/apache/coyote/http2/LocalStrings.properties
index 6ab82e8bdb9b..114f546017d4 100644
--- a/java/org/apache/coyote/http2/LocalStrings.properties
+++ b/java/org/apache/coyote/http2/LocalStrings.properties
@@ -77,6 +77,7 @@ http2Parser.processFrameHeaders.decodingDataLeft=Data left over after HPACK deco
 http2Parser.processFrameHeaders.decodingFailed=There was an error during the HPACK decoding of HTTP headers
 http2Parser.processFrameHeaders.payload=Connection [{0}], Stream [{1}], Processing headers payload of size [{2}]
 http2Parser.processFramePriorityUpdate.debug=Connection [{0}], Stream [{1}], Urgency [{2}], Incremental [{3}]
+http2Parser.processFramePriorityUpdate.invalid=Connection [{0}], Stream [{1}], Priority Update frame with invalid priority field value
 http2Parser.processFramePriorityUpdate.streamZero=Connection [{0}], Priority update frame received to prioritize stream zero
 http2Parser.processFramePushPromise=Connection [{0}], Stream [{1}], Push promise frames should not be sent by the client
 http2Parser.processFrameSettings.ackWithNonZeroPayload=Settings frame received with the ACK flag set and payload present
diff --git a/test/org/apache/coyote/http2/TestRfc9218.java b/test/org/apache/coyote/http2/TestRfc9218.java
index eb9256d2a140..1a6081f88c99 100644
--- a/test/org/apache/coyote/http2/TestRfc9218.java
+++ b/test/org/apache/coyote/http2/TestRfc9218.java
@@ -17,6 +17,7 @@
 package org.apache.coyote.http2;
 
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 
 import org.junit.Assert;
 import org.junit.Test;
@@ -146,6 +147,9 @@ public void testPriority() throws Exception {
         // 19 - 7021 body left
         // 21 - 6143 body left
 
+        // BZ 69614 - invalid priority update frames should be ignored
+        sendInvalidPriorityUpdate(17);
+
         // Re-order the priorities
         sendPriorityUpdate(17, 2, true);
 
@@ -191,4 +195,25 @@ public void testPriority() throws Exception {
             ioe.printStackTrace();
         }
     }
+
+
+    private void sendInvalidPriorityUpdate(int streamId) throws IOException {
+        byte[] payload = "u=1:i".getBytes(StandardCharsets.US_ASCII);
+
+        byte[] priorityUpdateFrame = new byte[13 + payload.length];
+
+        // length
+        ByteUtil.setThreeBytes(priorityUpdateFrame, 0, 4 + payload.length);
+        // type
+        priorityUpdateFrame[3] = FrameType.PRIORITY_UPDATE.getIdByte();
+        // Stream ID
+        ByteUtil.set31Bits(priorityUpdateFrame, 5, 0);
+
+        // Payload
+        ByteUtil.set31Bits(priorityUpdateFrame, 9, streamId);
+        System.arraycopy(payload, 0, priorityUpdateFrame, 13, payload.length);
+
+        os.write(priorityUpdateFrame);
+        os.flush();
+    }
 }