tree ca1ad2b0cabe6f910e401a525d75e1fd7b745e16
parent 07dee30e0c89b63b531156d6f58acaf529a71ee1
author markchien <markchien@google.com> 1645159682 +0800
committer Maciej Żenczykowski <maze@google.com> 1645179075 +0000

Fix system_server crash while iterating CookieTagMap

When uid is removed, NetworkStatsService will iterate CookieTagMap and
delete the corresponded uid socketTag value. But not only
NetworkStatsService would detete CookieTagMap entries. There are other
threads may also delete CookieTagMap entries such as #unTagSocket in
bpfHandler and desctroy socket listener in TrafficController. System
server crash as NPE because the CookieTagMap entry it iterate just be
removed by other threads at the same time. This is just a simple fix to
prevent the crash. Will have follow up CL for formal fix.

Bug: 220084230
Test: m
Change-Id: I08cad87f537fb09499faf1ff5cfd443fcb8ce436