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    Subject[PATCH 5.5 103/176] net/smc: transfer fasync_list in case of fallback
    Date
    From: Ursula Braun <ubraun@linux.ibm.com>

    commit 67f562e3e147750a02b2a91d21a163fc44a1d13e upstream.

    SMC does not work together with FASTOPEN. If sendmsg() is called with
    flag MSG_FASTOPEN in SMC_INIT state, the SMC-socket switches to
    fallback mode. To handle the previous ioctl FIOASYNC call correctly
    in this case, it is necessary to transfer the socket wait queue
    fasync_list to the internal TCP socket.

    Reported-by: syzbot+4b1fe8105f8044a26162@syzkaller.appspotmail.com
    Fixes: ee9dfbef02d18 ("net/smc: handle sockopts forcing fallback")
    Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
    Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    net/smc/af_smc.c | 2 ++
    1 file changed, 2 insertions(+)

    --- a/net/smc/af_smc.c
    +++ b/net/smc/af_smc.c
    @@ -470,6 +470,8 @@ static void smc_switch_to_fallback(struc
    if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
    smc->clcsock->file = smc->sk.sk_socket->file;
    smc->clcsock->file->private_data = smc->clcsock;
    + smc->clcsock->wq.fasync_list =
    + smc->sk.sk_socket->wq.fasync_list;
    }
    }


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