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net: qrtr: Allocate workqueue before kernel_bind

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A null pointer dereference in qrtr_ns_data_ready() is seen if a client
opens a qrtr socket before qrtr_ns_init() can bind to the control port.
When the control port is bound, the ENETRESET error will be broadcasted
and clients will close their sockets. This results in DEL_CLIENT
packets being sent to the ns and qrtr_ns_data_ready() being called
without the workqueue being allocated.

Allocate the workqueue before setting sk_data_ready and binding to the
control port. This ensures that the work and workqueue structs are
allocated and initialized before qrtr_ns_data_ready can be called.

Change-Id: Ib20aec56414789905ccd80a91290fca9e3c29ead
Signed-off-by: Chris Lew <clew@codeaurora.org>
This commit is contained in:
Chris Lew 2020-05-28 14:20:36 -07:00
commit 5b40b16f3c
1 changed files with 5 additions and 5 deletions
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10
net/qrtr/ns.c
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@ -717,6 +717,10 @@ void qrtr_ns_init(void)
goto err_sock;
}
qrtr_ns.workqueue = alloc_workqueue("qrtr_ns_handler", WQ_UNBOUND, 1);
if (!qrtr_ns.workqueue)
goto err_sock;
qrtr_ns.sock->sk->sk_data_ready = qrtr_ns_data_ready;
sq.sq_port = QRTR_PORT_CTRL;
@ -725,17 +729,13 @@ void qrtr_ns_init(void)
ret = kernel_bind(qrtr_ns.sock, (struct sockaddr *)&sq, sizeof(sq));
if (ret < 0) {
pr_err("failed to bind to socket\n");
goto err_sock;
goto err_wq;
}
qrtr_ns.bcast_sq.sq_family = AF_QIPCRTR;
qrtr_ns.bcast_sq.sq_node = QRTR_NODE_BCAST;
qrtr_ns.bcast_sq.sq_port = QRTR_PORT_CTRL;
qrtr_ns.workqueue = alloc_workqueue("qrtr_ns_handler", WQ_UNBOUND, 1);
if (!qrtr_ns.workqueue)
goto err_sock;
ret = say_hello(&qrtr_ns.bcast_sq);
if (ret < 0)
goto err_wq;