Check for malformed Sensor Flattenable

Test: libsensorserviceaidl_fuzzer with testcase from bug
Bug: 269014004
Merged-In: I0e255c64243c38876fb657cbf942fc1613363216
Change-Id: I0e255c64243c38876fb657cbf942fc1613363216
(cherry picked from commit aeec1802f7befc8fbb18313ad3ac0969c3811870)
Merged-In: I0e255c64243c38876fb657cbf942fc1613363216

1 files changed, 6 insertions, 0 deletions

diff --git a/libs/sensor/Sensor.cpp b/libs/sensor/Sensor.cpp
index 9d817ae0bd..d71f27106e 100644
--- a/libs/sensor/Sensor.cpp
+++ b/libs/sensor/Sensor.cpp
@@ -595,7 +595,13 @@ bool Sensor::unflattenString8(void const*& buffer, size_t& size, String8& output
         return false;
     }
     outputString8.setTo(static_cast<char const*>(buffer), len);
+
+    if (size < FlattenableUtils::align<4>(len)) {
+        ALOGE("Malformed Sensor String8 field. Should be in a 4-byte aligned buffer but is not.");
+        return false;
+    }
     FlattenableUtils::advance(buffer, size, FlattenableUtils::align<4>(len));
+
     return true;
 }