CEC : Add additional validator for message record status

Test: make
Bug: 159901363
Change-Id: I5fb87e6b55d89ad94ef99bf05489b82524fddade

1 files changed, 22 insertions, 2 deletions

diff --git a/services/core/java/com/android/server/hdmi/HdmiCecMessageValidator.java b/services/core/java/com/android/server/hdmi/HdmiCecMessageValidator.java
index 0b4f31d365d3..28bd97e4843c 100644
--- a/services/core/java/com/android/server/hdmi/HdmiCecMessageValidator.java
+++ b/services/core/java/com/android/server/hdmi/HdmiCecMessageValidator.java
@@ -117,14 +117,15 @@ public class HdmiCecMessageValidator {
         // TODO: Validate more than length for the following messages.
 
         // Messages for the One Touch Record.
-        FixedLengthValidator oneByteValidator = new FixedLengthValidator(1);
         addValidationInfo(Constants.MESSAGE_RECORD_ON,
                 new VariableLengthValidator(1, 8), DEST_DIRECT);
-        addValidationInfo(Constants.MESSAGE_RECORD_STATUS, oneByteValidator, DEST_DIRECT);
+        addValidationInfo(Constants.MESSAGE_RECORD_STATUS,
+                new RecordStatusInfoValidator(), DEST_DIRECT);
 
         // TODO: Handle messages for the Timer Programming.
 
         // Messages for the System Information.
+        FixedLengthValidator oneByteValidator = new FixedLengthValidator(1);
         addValidationInfo(Constants.MESSAGE_CEC_VERSION, oneByteValidator, DEST_DIRECT);
         addValidationInfo(Constants.MESSAGE_SET_MENU_LANGUAGE,
                 new FixedLengthValidator(3), DEST_BROADCAST);
@@ -339,4 +340,23 @@ public class HdmiCecMessageValidator {
                     isValidPhysicalAddress(params, 0) && isValidPhysicalAddress(params, 2));
         }
     }
+
+    /**
+     * Check if the given record status message parameter is valid.
+     * A valid parameter should lie within the range description of Record Status Info defined in
+     * CEC 1.4 Specification : Operand Descriptions (Section 17)
+     */
+    private class RecordStatusInfoValidator implements ParameterValidator {
+        @Override
+        public int isValid(byte[] params) {
+            if (params.length < 1) {
+                return ERROR_PARAMETER_SHORT;
+            }
+            return toErrorCode(isWithinRange(params[0], 0x01, 0x07)
+                            || isWithinRange(params[0], 0x09, 0x0E)
+                            || isWithinRange(params[0], 0x10, 0x17)
+                            || isWithinRange(params[0], 0x1A, 0x1B)
+                            || params[0] == 0x1F);
+        }
+    }
 }