Commit 67f562e3 authored Feb 14, 2020 by Ursula Braun Committed by David S. Miller Feb 14, 2020

net/smc: transfer fasync_list in case of fallback



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: ee9dfbef ("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>

parent dc221a28

net/smc/af_smc.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -470,6 +470,8 @@ static void smc_switch_to_fallback(struct smc_sock *smc)
		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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