Don't allow restore sessions during backups

Gracefully no-op if apps attempt to restore themselves while there is
a backup pass in flight.

Bug 29135379

Change-Id: I8f0b5cd9d149b703e1de7a3a0b4b54c3aff766b6

1 files changed, 5 insertions, 1 deletions

diff --git a/services/backup/java/com/android/server/backup/BackupManagerService.java b/services/backup/java/com/android/server/backup/BackupManagerService.java
index acc2ec30d67f..334b228a4ab7 100644
--- a/services/backup/java/com/android/server/backup/BackupManagerService.java
+++ b/services/backup/java/com/android/server/backup/BackupManagerService.java
@@ -9849,7 +9849,11 @@ if (MORE_DEBUG) Slog.v(TAG, "   + got " + nRead + "; now wanting " + (size - soF
 
         synchronized(this) {
             if (mActiveRestoreSession != null) {
-                Slog.d(TAG, "Restore session requested but one already active");
+                Slog.i(TAG, "Restore session requested but one already active");
+                return null;
+            }
+            if (mBackupRunning) {
+                Slog.i(TAG, "Restore session requested but currently running backups");
                 return null;
             }
             mActiveRestoreSession = new ActiveRestoreSession(packageName, transport);