Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 070204a3 authored by Ursula Braun's avatar Ursula Braun Committed by David S. Miller
Browse files

net/smc: keep clcsock reference in smc_tcp_listen_work() 



The internal CLC socket should exist till the SMC-socket is released.
Function tcp_listen_worker() releases the internal CLC socket of a
listen socket, if an smc_close_active() is called. This function
is called for the final release(), but it is called for shutdown
SHUT_RDWR as well. This opens a door for protection faults, if
socket calls using the internal CLC socket are called for a
shutdown listen socket.

With the changes of
commit 3d502067 ("net/smc: simplify wait when closing listen socket")
there is no need anymore to release the internal CLC socket in
function tcp_listen_worker((). It is sufficient to release it in
smc_release().

Fixes: 127f4970 ("net/smc: release clcsock from tcp_listen_worker")
Signed-off-by: default avatarUrsula Braun <ubraun@linux.ibm.com>
Reported-by: default avatar <syzbot+9045fc589fcd196ef522@syzkaller.appspotmail.com>
Reported-by: default avatar <syzbot+28a2c86cf19c81d871fa@syzkaller.appspotmail.com>
Reported-by: default avatar <syzbot+9605e6cace1b5efd4a0a@syzkaller.appspotmail.com>
Reported-by: default avatar <syzbot+cf9012c597c8379d535c@syzkaller.appspotmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 02a6efca

net/smc/af_smc.c

+0 −4
Original line number Diff line number Diff line
@@ -978,10 +978,6 @@ static void smc_tcp_listen_work(struct work_struct *work) 
	}



out:

	if (lsmc->clcsock) {

		sock_release(lsmc->clcsock);

		lsmc->clcsock = NULL;

	}

	release_sock(lsk);

	sock_put(&lsmc->sk); /* sock_hold in smc_listen */

}