Fix thread race caused double free issue.

am: 5754b41c20

Change-Id: Ic9dd6e9c6d216753d997da99158816682d5464d1

libs/androidfw/AssetManager.cpp

@@ -1893,6 +1893,7 @@ ZipFileRO* AssetManager::SharedZip::getZip()
 
 Asset* AssetManager::SharedZip::getResourceTableAsset()
 {
+    AutoMutex _l(gLock);
     ALOGV("Getting from SharedZip %p resource asset %p\n", this, mResourceTableAsset);
     return mResourceTableAsset;
 }
@@ -1902,10 +1903,10 @@ Asset* AssetManager::SharedZip::setResourceTableAsset(Asset* asset)
     {
         AutoMutex _l(gLock);
         if (mResourceTableAsset == NULL) {
-            mResourceTableAsset = asset;
             // This is not thread safe the first time it is called, so
             // do it here with the global lock held.
             asset->getBuffer(true);
+            mResourceTableAsset = asset;
             return asset;
         }
     }