tunnel: avoid race between shutdown and stats

wgTurnOff can block for a while, in which case, calling getStatistics
will use a stale handle and stale tunnel. Not only that, but wgGetConfig
might return null, in which case string.split throws.

    java.lang.NullPointerException: Attempt to invoke virtual method
    'java.lang.String[] java.lang.String.split(java.lang.String)' on a null
    at com.wireguard.android.backend.GoBackend.getStatistics

Reported-by: tomt@adslweb.co.uk
Link: https://lists.zx2c4.com/pipermail/wireguard/2021-May/006709.html
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

0 files changed, 0 insertions, 0 deletions