[automerger] libbinder: readCString: no ubsan sub-overflow am: d0d4b584fc am: a7134ad559 am: 7e71b6ee21 am: 2537a8b5b6 am: 85c1e41520 am: 6658f2faec
am: a9d88cd608

Change-Id: If0c72bf15dbf095269e6079e091c35496c00bff7