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tls: check RCV_SHUTDOWN in tls_wait_data

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The current code does not check sk->sk_shutdown & RCV_SHUTDOWN.
tls_sw_recvmsg may return a positive value in the case where bytes have
already been copied when the socket is shutdown. sk->sk_err has been
cleared, causing the tls_wait_data to hang forever on a subsequent
invocation. Checking sk->sk_shutdown & RCV_SHUTDOWN, as in tcp_recvmsg,
fixes this problem.

Fixes: c46234ebb4 ("tls: RX path for ktls")
Acked-by: Dave Watson <davejwatson@fb.com>
Signed-off-by: Doron Roberts-Kedes <doronrk@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Doron Roberts-Kedes 2018-07-18 16:22:27 -07:00 • committed by David S. Miller
parent f7a6eb1e15
commit fcf4793e27
1 changed files with 3 additions and 0 deletions
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3
net/tls/tls_sw.c
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@ -646,6 +646,9 @@ static struct sk_buff *tls_wait_data(struct sock *sk, int flags,
return NULL;
}
if (sk->sk_shutdown & RCV_SHUTDOWN)
return NULL;
if (sock_flag(sk, SOCK_DONE))
return NULL;