tasks/codeql_java_benchmark_top30_v2/morefixes-1f67e1cf382f2e332752/patch.diff

diff --git a/codec-classes-quic/src/main/java/io/netty/incubator/codec/quic/ConnectionIdChannelMap.java b/codec-classes-quic/src/main/java/io/netty/incubator/codec/quic/ConnectionIdChannelMap.java
new file mode 100644
index 0000000..eab9336
--- /dev/null
+++ b/codec-classes-quic/src/main/java/io/netty/incubator/codec/quic/ConnectionIdChannelMap.java
@@ -0,0 +1,100 @@
+/*
+ * Copyright 2025 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.incubator.codec.quic;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.nio.ByteBuffer;
+import java.security.SecureRandom;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+
+/**
+ * We use a custom hash that uses SipHash 1-3 to prevent
+ * <a href="https://github.com/ncc-pbottine/QUIC-Hash-Dos-Advisory">Hash Denial-of-Service Attacks</a>.
+ */
+final class ConnectionIdChannelMap {
+    private static final SecureRandom random = new SecureRandom();
+
+    private final Map<ConnectionIdKey, QuicheQuicChannel> channelMap = new HashMap<>();
+    private final SipHash sipHash;
+
+    ConnectionIdChannelMap() {
+        byte[] seed = new byte[SipHash.SEED_LENGTH];
+        random.nextBytes(seed);
+        // Use SipHash 1-3 for now which is also what rust is using by default.
+        sipHash = new SipHash(1, 3, seed);
+    }
+
+    private ConnectionIdKey key(ByteBuffer cid) {
+        long hash = sipHash.macHash(cid);
+        return new ConnectionIdKey(hash, cid);
+    }
+
+    @Nullable
+    QuicheQuicChannel put(ByteBuffer cid, QuicheQuicChannel channel) {
+        return channelMap.put(key(cid), channel);
+    }
+
+    @Nullable
+    QuicheQuicChannel remove(ByteBuffer cid) {
+        return channelMap.remove(key(cid));
+    }
+
+    @Nullable
+    QuicheQuicChannel get(ByteBuffer cid) {
+        return channelMap.get(key(cid));
+    }
+
+    void clear() {
+        channelMap.clear();
+    }
+
+    private static final class ConnectionIdKey implements Comparable<ConnectionIdKey> {
+        private final long hash;
+        private final ByteBuffer key;
+
+        ConnectionIdKey(long hash, ByteBuffer key) {
+            this.hash = hash;
+            this.key = key;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) {
+                return true;
+            }
+            if (o == null || getClass() != o.getClass()) {
+                return false;
+            }
+            ConnectionIdKey that = (ConnectionIdKey) o;
+            return hash == that.hash && Objects.equals(key, that.key);
+        }
+
+        @Override
+        public int hashCode() {
+            return (int) hash;
+        }
+
+        @Override
+        public int compareTo(@NotNull ConnectionIdChannelMap.ConnectionIdKey o) {
+            int result = Long.compare(hash, o.hash);
+            return result != 0 ? result : key.compareTo(o.key);
+        }
+    }
+}
diff --git a/codec-classes-quic/src/main/java/io/netty/incubator/codec/quic/QuicheQuicCodec.java b/codec-classes-quic/src/main/java/io/netty/incubator/codec/quic/QuicheQuicCodec.java
index ae4807b..082fea8 100644
--- a/codec-classes-quic/src/main/java/io/netty/incubator/codec/quic/QuicheQuicCodec.java
+++ b/codec-classes-quic/src/main/java/io/netty/incubator/codec/quic/QuicheQuicCodec.java
@@ -29,9 +29,7 @@ import java.net.InetSocketAddress;
 import java.net.SocketAddress;
 import java.nio.ByteBuffer;
 import java.util.ArrayDeque;
-import java.util.HashMap;
 import java.util.HashSet;
-import java.util.Map;
 import java.util.Queue;
 import java.util.Set;
 import java.util.function.Consumer;
@@ -43,7 +41,7 @@ import static io.netty.incubator.codec.quic.Quiche.allocateNativeOrder;
  */
 abstract class QuicheQuicCodec extends ChannelDuplexHandler {
     private static final InternalLogger LOGGER = InternalLoggerFactory.getInstance(QuicheQuicCodec.class);
-    private final Map<ByteBuffer, QuicheQuicChannel> connectionIdToChannel = new HashMap<>();
+    private final ConnectionIdChannelMap connectionIdToChannel = new ConnectionIdChannelMap();
     private final Set<QuicheQuicChannel> channels = new HashSet<>();
     private final Queue<QuicheQuicChannel> needsFireChannelReadComplete = new ArrayDeque<>();
     private final Queue<QuicheQuicChannel> delayedRemoval = new ArrayDeque<>();
diff --git a/codec-classes-quic/src/main/java/io/netty/incubator/codec/quic/SipHash.java b/codec-classes-quic/src/main/java/io/netty/incubator/codec/quic/SipHash.java
new file mode 100644
index 0000000..86291a6
--- /dev/null
+++ b/codec-classes-quic/src/main/java/io/netty/incubator/codec/quic/SipHash.java
@@ -0,0 +1,150 @@
+/*
+ * Copyright 2025 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.incubator.codec.quic;
+
+import io.netty.util.internal.ObjectUtil;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+/**
+ * <a href="https://www.aumasson.jp/siphash/siphash.pdf">Siphash implementation</a>.
+ */
+final class SipHash {
+
+    static final int SEED_LENGTH = 16;
+
+    // Make this class allocation free as soon as its constructed.
+    private final int compressionRounds;
+    private final int finalizationRounds;
+
+    // As specified in https://www.aumasson.jp/siphash/siphash.pdf
+    private static final long INITIAL_STATE_V0 = 0x736f6d6570736575L; // "somepseu"
+    private static final long INITIAL_STATE_V1 = 0x646f72616e646f6dL; // "dorandom"
+    private static final long INITIAL_STATE_V2 = 0x6c7967656e657261L; // "lygenera"
+    private static final long INITIAL_STATE_V3 = 0x7465646279746573L;  // "tedbytes"
+
+    private final long initialStateV0;
+    private final long initialStateV1;
+    private final long initialStateV2;
+    private final long initialStateV3;
+
+    private long v0;
+    private long v1;
+    private long v2;
+    private long v3;
+
+    SipHash(int compressionRounds, int finalizationRounds, byte[] seed) {
+        if (seed.length != SEED_LENGTH) {
+            throw new IllegalArgumentException("seed must be of length " + SEED_LENGTH);
+        }
+        this.compressionRounds = ObjectUtil.checkPositive(compressionRounds, "compressionRounds");
+        this.finalizationRounds = ObjectUtil.checkPositive(finalizationRounds, "finalizationRounds");
+
+        // Wrap the seed to extract two longs that will be used to generate the initial state.
+        // Use little-endian as in the paper.
+        ByteBuffer keyBuffer = ByteBuffer.wrap(seed).order(ByteOrder.LITTLE_ENDIAN);
+        final long k0 = keyBuffer.getLong();
+        final long k1 = keyBuffer.getLong();
+
+        initialStateV0 = INITIAL_STATE_V0 ^ k0;
+        initialStateV1 = INITIAL_STATE_V1 ^ k1;
+        initialStateV2 = INITIAL_STATE_V2 ^ k0;
+        initialStateV3 = INITIAL_STATE_V3 ^ k1;
+    }
+
+    long macHash(ByteBuffer input) {
+        v0 = initialStateV0;
+        v1 = initialStateV1;
+        v2 = initialStateV2;
+        v3 = initialStateV3;
+        int remaining = input.remaining();
+        int position = input.position();
+        int len = remaining - (remaining % Long.BYTES);
+        boolean needsReverse = input.order() == ByteOrder.BIG_ENDIAN;
+        for (int offset = position; offset < len; offset +=  Long.BYTES) {
+            long m = input.getLong(offset);
+            if (needsReverse) {
+                // We use little-endian as in the paper.
+                m = Long.reverseBytes(m);
+            }
+            v3 ^= m;
+            for (int i = 0; i < compressionRounds; i++) {
+                sipround();
+            }
+            v0 ^= m;
+        }
+
+        // Get last bits.
+        final int left = remaining & (Long.BYTES - 1);
+        long b = (long) remaining << 56;
+        assert left < Long.BYTES;
+        switch (left) {
+            case 7:
+                b |= ((long) input.get(position + len + 6) << 48);
+            case 6:
+                b |= ((long) input.get(position + len + 5) << 40);
+            case 5:
+                b |= ((long) input.get(position + len + 4) << 32);
+            case 4:
+                b |= ((long) input.get(position + len + 3) << 24);
+            case 3:
+                b |= ((long) input.get(position + len + 2) << 16);
+            case 2:
+                b |= ((long) input.get(position + len + 1) << 8);
+            case 1:
+                b |= input.get(position + len);
+                break;
+            case 0:
+                break;
+            default:
+                throw new IllegalStateException("Unexpected value: " + left);
+        }
+
+        v3 ^= b;
+        for (int i = 0; i < compressionRounds; i++) {
+            sipround();
+        }
+
+        v0 ^= b;
+        v2 ^= 0xFF;
+        for (int i = 0; i < finalizationRounds; i++) {
+            sipround();
+        }
+
+        return v0 ^ v1 ^ v2 ^ v3;
+    }
+
+    private void sipround() {
+        v0 += v1;
+        v2 += v3;
+        v1 = Long.rotateLeft(v1, 13);
+        v3 = Long.rotateLeft(v3, 16);
+        v1 ^= v0;
+        v3 ^= v2;
+
+        v0 = Long.rotateLeft(v0, 32);
+
+        v2 += v1;
+        v0 += v3;
+        v1 = Long.rotateLeft(v1, 17);
+        v3 = Long.rotateLeft(v3, 21);
+        v1 ^= v2;
+        v3 ^= v0;
+
+        v2 = Long.rotateLeft(v2, 32);
+    }
+}
diff --git a/codec-native-quic/src/test/java/io/netty/incubator/codec/quic/SipHashTest.java b/codec-native-quic/src/test/java/io/netty/incubator/codec/quic/SipHashTest.java
new file mode 100644
index 0000000..930629e
--- /dev/null
+++ b/codec-native-quic/src/test/java/io/netty/incubator/codec/quic/SipHashTest.java
@@ -0,0 +1,158 @@
+/*
+ * Copyright 2025 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.incubator.codec.quic;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.util.concurrent.ThreadLocalRandom;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+
+public class SipHashTest {
+
+    private static final byte[] REFERENCE_SEED = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+            0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F };
+
+    private static final int[][] REFERENCE_OUTPUT = {
+            { 0x31, 0x0e, 0x0e, 0xdd, 0x47, 0xdb, 0x6f, 0x72, },
+            { 0xfd, 0x67, 0xdc, 0x93, 0xc5, 0x39, 0xf8, 0x74, },
+            { 0x5a, 0x4f, 0xa9, 0xd9, 0x09, 0x80, 0x6c, 0x0d, },
+            { 0x2d, 0x7e, 0xfb, 0xd7, 0x96, 0x66, 0x67, 0x85, },
+            { 0xb7, 0x87, 0x71, 0x27, 0xe0, 0x94, 0x27, 0xcf, },
+            { 0x8d, 0xa6, 0x99, 0xcd, 0x64, 0x55, 0x76, 0x18, },
+            { 0xce, 0xe3, 0xfe, 0x58, 0x6e, 0x46, 0xc9, 0xcb, },
+            { 0x37, 0xd1, 0x01, 0x8b, 0xf5, 0x00, 0x02, 0xab, },
+            { 0x62, 0x24, 0x93, 0x9a, 0x79, 0xf5, 0xf5, 0x93, },
+            { 0xb0, 0xe4, 0xa9, 0x0b, 0xdf, 0x82, 0x00, 0x9e, },
+            { 0xf3, 0xb9, 0xdd, 0x94, 0xc5, 0xbb, 0x5d, 0x7a, },
+            { 0xa7, 0xad, 0x6b, 0x22, 0x46, 0x2f, 0xb3, 0xf4, },
+            { 0xfb, 0xe5, 0x0e, 0x86, 0xbc, 0x8f, 0x1e, 0x75, },
+            { 0x90, 0x3d, 0x84, 0xc0, 0x27, 0x56, 0xea, 0x14, },
+            { 0xee, 0xf2, 0x7a, 0x8e, 0x90, 0xca, 0x23, 0xf7, },
+            { 0xe5, 0x45, 0xbe, 0x49, 0x61, 0xca, 0x29, 0xa1, },
+            { 0xdb, 0x9b, 0xc2, 0x57, 0x7f, 0xcc, 0x2a, 0x3f, },
+            { 0x94, 0x47, 0xbe, 0x2c, 0xf5, 0xe9, 0x9a, 0x69, },
+            { 0x9c, 0xd3, 0x8d, 0x96, 0xf0, 0xb3, 0xc1, 0x4b, },
+            { 0xbd, 0x61, 0x79, 0xa7, 0x1d, 0xc9, 0x6d, 0xbb, },
+            { 0x98, 0xee, 0xa2, 0x1a, 0xf2, 0x5c, 0xd6, 0xbe, },
+            { 0xc7, 0x67, 0x3b, 0x2e, 0xb0, 0xcb, 0xf2, 0xd0, },
+            { 0x88, 0x3e, 0xa3, 0xe3, 0x95, 0x67, 0x53, 0x93, },
+            { 0xc8, 0xce, 0x5c, 0xcd, 0x8c, 0x03, 0x0c, 0xa8, },
+            { 0x94, 0xaf, 0x49, 0xf6, 0xc6, 0x50, 0xad, 0xb8, },
+            { 0xea, 0xb8, 0x85, 0x8a, 0xde, 0x92, 0xe1, 0xbc, },
+            { 0xf3, 0x15, 0xbb, 0x5b, 0xb8, 0x35, 0xd8, 0x17, },
+            { 0xad, 0xcf, 0x6b, 0x07, 0x63, 0x61, 0x2e, 0x2f, },
+            { 0xa5, 0xc9, 0x1d, 0xa7, 0xac, 0xaa, 0x4d, 0xde, },
+            { 0x71, 0x65, 0x95, 0x87, 0x66, 0x50, 0xa2, 0xa6, },
+            { 0x28, 0xef, 0x49, 0x5c, 0x53, 0xa3, 0x87, 0xad, },
+            { 0x42, 0xc3, 0x41, 0xd8, 0xfa, 0x92, 0xd8, 0x32, },
+            { 0xce, 0x7c, 0xf2, 0x72, 0x2f, 0x51, 0x27, 0x71, },
+            { 0xe3, 0x78, 0x59, 0xf9, 0x46, 0x23, 0xf3, 0xa7, },
+            { 0x38, 0x12, 0x05, 0xbb, 0x1a, 0xb0, 0xe0, 0x12, },
+            { 0xae, 0x97, 0xa1, 0x0f, 0xd4, 0x34, 0xe0, 0x15, },
+            { 0xb4, 0xa3, 0x15, 0x08, 0xbe, 0xff, 0x4d, 0x31, },
+            { 0x81, 0x39, 0x62, 0x29, 0xf0, 0x90, 0x79, 0x02, },
+            { 0x4d, 0x0c, 0xf4, 0x9e, 0xe5, 0xd4, 0xdc, 0xca, },
+            { 0x5c, 0x73, 0x33, 0x6a, 0x76, 0xd8, 0xbf, 0x9a, },
+            { 0xd0, 0xa7, 0x04, 0x53, 0x6b, 0xa9, 0x3e, 0x0e, },
+            { 0x92, 0x59, 0x58, 0xfc, 0xd6, 0x42, 0x0c, 0xad, },
+            { 0xa9, 0x15, 0xc2, 0x9b, 0xc8, 0x06, 0x73, 0x18, },
+            { 0x95, 0x2b, 0x79, 0xf3, 0xbc, 0x0a, 0xa6, 0xd4, },
+            { 0xf2, 0x1d, 0xf2, 0xe4, 0x1d, 0x45, 0x35, 0xf9, },
+            { 0x87, 0x57, 0x75, 0x19, 0x04, 0x8f, 0x53, 0xa9, },
+            { 0x10, 0xa5, 0x6c, 0xf5, 0xdf, 0xcd, 0x9a, 0xdb, },
+            { 0xeb, 0x75, 0x09, 0x5c, 0xcd, 0x98, 0x6c, 0xd0, },
+            { 0x51, 0xa9, 0xcb, 0x9e, 0xcb, 0xa3, 0x12, 0xe6, },
+            { 0x96, 0xaf, 0xad, 0xfc, 0x2c, 0xe6, 0x66, 0xc7, },
+            { 0x72, 0xfe, 0x52, 0x97, 0x5a, 0x43, 0x64, 0xee, },
+            { 0x5a, 0x16, 0x45, 0xb2, 0x76, 0xd5, 0x92, 0xa1, },
+            { 0xb2, 0x74, 0xcb, 0x8e, 0xbf, 0x87, 0x87, 0x0a, },
+            { 0x6f, 0x9b, 0xb4, 0x20, 0x3d, 0xe7, 0xb3, 0x81, },
+            { 0xea, 0xec, 0xb2, 0xa3, 0x0b, 0x22, 0xa8, 0x7f, },
+            { 0x99, 0x24, 0xa4, 0x3c, 0xc1, 0x31, 0x57, 0x24, },
+            { 0xbd, 0x83, 0x8d, 0x3a, 0xaf, 0xbf, 0x8d, 0xb7, },
+            { 0x0b, 0x1a, 0x2a, 0x32, 0x65, 0xd5, 0x1a, 0xea, },
+            { 0x13, 0x50, 0x79, 0xa3, 0x23, 0x1c, 0xe6, 0x60, },
+            { 0x93, 0x2b, 0x28, 0x46, 0xe4, 0xd7, 0x06, 0x66, },
+            { 0xe1, 0x91, 0x5f, 0x5c, 0xb1, 0xec, 0xa4, 0x6c, },
+            { 0xf3, 0x25, 0x96, 0x5c, 0xa1, 0x6d, 0x62, 0x9f, },
+            { 0x57, 0x5f, 0xf2, 0x8e, 0x60, 0x38, 0x1b, 0xe5, },
+            { 0x72, 0x45, 0x06, 0xeb, 0x4c, 0x32, 0x8a, 0x95, }
+    };
+
+    static class ReferenceTestParam {
+        private final byte[] input;
+        private final long expectedOutput;
+
+        ReferenceTestParam(byte[] input, long expectedOutput) {
+            this.input = input;
+            this.expectedOutput = expectedOutput;
+        }
+    }
+
+    static ReferenceTestParam[] params() {
+        ReferenceTestParam[] testCases = new ReferenceTestParam[64];
+        // Use little-endian as this is what is expected by the reference output.
+        ByteBuffer bb = ByteBuffer.allocate(8).order(ByteOrder.LITTLE_ENDIAN);
+        for (int i = 0; i < testCases.length; ++i) {
+            byte[] input = new byte[i];
+            for (int j = 0; j < input.length; ++j) {
+                input[j] = (byte) j;
+            }
+            for (int v: REFERENCE_OUTPUT[i]) {
+                bb.put((byte) v);
+            }
+            bb.flip();
+            testCases[i] = new ReferenceTestParam(input, bb.getLong());
+            bb.clear();
+        }
+        return testCases;
+    }
+
+    @ParameterizedTest
+    @MethodSource("params")
+    void testReferenceCases(ReferenceTestParam param ) {
+        SipHash hash = new SipHash(2, 4, REFERENCE_SEED);
+        long h = hash.macHash(ByteBuffer.wrap(param.input));
+        assertEquals(param.expectedOutput, h);
+    }
+
+    @Test
+    void testHash() {
+        byte[] bytes = new byte[64];
+        ThreadLocalRandom.current().nextBytes(bytes);
+
+        byte[] seed = new byte[16];
+        ThreadLocalRandom.current().nextBytes(seed);
+        SipHash hash = new SipHash(1, 3, seed);
+
+        ByteBuffer buffer = ByteBuffer.wrap(bytes);
+        ByteBuffer emptyBuffer = ByteBuffer.wrap(new byte[0]);
+
+        long bufferHash = hash.macHash(buffer);
+        assertEquals(bufferHash, hash.macHash(buffer));
+
+        long emptyBufferHash = hash.macHash(emptyBuffer);
+        assertEquals(emptyBufferHash, hash.macHash(emptyBuffer));
+
+        assertNotEquals(bufferHash, emptyBufferHash);
+    }
+}