Prevent interleaved verification

Committing a session twice in a row will result in interleaved
verification flows and break the internal states.

Add a field to prevent this from happening if the verification
is already in progress.

Bug: 256330705
Test: manual test
Change-Id: I7e8a2fa7333d05a226268b325338e3fac69ddae0

services/core/java/com/android/server/pm/PackageInstallerSession.java

@@ -380,6 +380,14 @@ public class PackageInstallerSession extends IPackageInstallerSession.Stub {
     @GuardedBy("mLock")
     private boolean mStageDirInUse = false;
 
+    /**
+     * True if the verification is already in progress. This is used to prevent running
+     * verification again while one is already in progress which will break internal states.
+     *
+     * Worker thread only.
+     */
+    private boolean mVerificationInProgress = false;
+
     /** Permissions have been accepted by the user (see {@link #setPermissionsResult}) */
     @GuardedBy("mLock")
     private boolean mPermissionsManuallyAccepted = false;
@@ -2201,6 +2209,12 @@ public class PackageInstallerSession extends IPackageInstallerSession.Stub {
             activate();
         }
 
+        if (mVerificationInProgress) {
+            Slog.w(TAG, "Verification is already in progress for session " + sessionId);
+            return;
+        }
+        mVerificationInProgress = true;
+
         if (params.isStaged) {
             mStagedSession.verifySession();
         } else {