[O] Aimedb: ignore invalid requests

src/main/java/icu/samnyan/aqua/sega/aimedb/AimeDbDecoder.kt

@@ -25,8 +25,7 @@ class AimeDbDecoder : ByteToMessageDecoder() {
     override fun decode(ctx: ChannelHandlerContext, input: ByteBuf, out: MutableList<Any>) {
         if (input.readableBytes() < 16) return
         if (length == 0) length = getLength(input)
-
-        if (input.readableBytes() < length) return
+        if (length < 0 || input.readableBytes() < length) return
 
         // Create a byte array to store the encrypted data
         val result = AimeDbEncryption.decrypt(input.readBytes(length))
@@ -46,7 +45,7 @@ class AimeDbDecoder : ByteToMessageDecoder() {
      * @param input the request
      * @return int the length of this request
      */
-    private fun getLength(input: ByteBuf): Int {
+    private fun getLength(input: ByteBuf): Int = try {
         val currentPos = input.readerIndex()
         val result = AimeDbEncryption.decrypt(input)
 
@@ -55,6 +54,10 @@ class AimeDbDecoder : ByteToMessageDecoder() {
         assert(header == 0x3e) { "AimeDB: Invalid header $header" }
 
         // Read the length from offset 6
-        return result.getShortLE(currentPos + 6).toInt()
+        result.getShortLE(currentPos + 6).toInt()
+    } catch (e: Exception) {
+        logger.info("AimeDB: Invalid request received")
+        logger.debug("AimeDB: Invalid request received: ${input.toString(Charsets.UTF_8)}")
+        -1
     }
 }