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Commit 0eab8214 authored by Mathias Agopian's avatar Mathias Agopian
Browse files

fix [4026375] SensorManager quaternion functions can call sqrt with a negative number 

Just make sure to clamp the argument to zero.

Bug: 4026375
Change-Id: I00c5f6c83659a290d5e1e191a1c8d25ec06834c2
parent c5f7f582

core/java/android/hardware/SensorManager.java

+2 −2
Original line number Diff line number Diff line
@@ -2051,8 +2051,8 @@ public class SensorManager 
        if (rv.length == 4) {

            Q[0] = rv[3];

        } else {

            //In this case, the w component of the quaternion is known to be a positive number

            Q[0] = (float)Math.sqrt(1 - rv[0]*rv[0] - rv[1]*rv[1] - rv[2]*rv[2]);

            Q[0] = 1 - rv[0]*rv[0] - rv[1]*rv[1] - rv[2]*rv[2];

            Q[0] = (Q[0] > 0) ? (float)Math.sqrt(Q[0]) : 0;

        }

        Q[1] = rv[0];

        Q[2] = rv[1];