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net/tls: swap sk_write_space on close 

Now that we swap the original proto and clear the ULP pointer
on close we have to make sure no callback will try to access
the freed state. sk_write_space is not part of sk_prot, remember
to swap it.

Reported-by: syzbot+dcdc9deefaec44785f32@syzkaller.appspotmail.com
Fixes: 95fa145479 ("bpf: sockmap/tls, close can race with map free")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2019-08-09 18:36:23 -07:00 committed by David S. Miller
parent 6d0d779dca
commit 57c722e932
1 changed files with 1 additions and 0 deletions
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net/tls/tls_main.c
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@ -308,6 +308,7 @@ static void tls_sk_proto_close(struct sock *sk, long timeout)
if (free_ctx)
icsk->icsk_ulp_data = NULL;
sk->sk_prot = ctx->sk_proto;
sk->sk_write_space = ctx->sk_write_space;
write_unlock_bh(&sk->sk_callback_lock);
release_sock(sk);
if (ctx->tx_conf == TLS_SW)