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virtio-serial-bus: send_control_msg() should not deal with cpkts 

Stuff the cpkt before calling send_control_msg().  This function should
not be concerned about contents of the buffer it receives.

A few code refactorings recently have made making this change easier
than earlier.

Coverity and clang have flagged this code several times in the past
(cpkt->id not set before send_control_event() passed it on to
send_control_msg()).  This will finally eliminate the false-positive.

CC: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
This commit is contained in:
Amit Shah 2012-12-12 18:26:09 +05:30
parent a75bf14650
commit 4e28976e56
1 changed files with 18 additions and 21 deletions
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39
hw/virtio-serial-bus.c
View File

@ -217,13 +217,12 @@ static void flush_queued_data(VirtIOSerialPort *port)
do_flush_queued_data(port, port->ovq, &port->vser->vdev);
}
static size_t send_control_msg(VirtIOSerialPort *port, void *buf, size_t len)
static size_t send_control_msg(VirtIOSerial *vser, void *buf, size_t len)
{
VirtQueueElement elem;
VirtQueue *vq;
struct virtio_console_control *cpkt;
vq = port->vser->c_ivq;
vq = vser->c_ivq;
if (!virtio_queue_ready(vq)) {
return 0;
}
@ -231,25 +230,24 @@ static size_t send_control_msg(VirtIOSerialPort *port, void *buf, size_t len)
return 0;
}
cpkt = (struct virtio_console_control *)buf;
stl_p(&cpkt->id, port->id);
memcpy(elem.in_sg[0].iov_base, buf, len);
virtqueue_push(vq, &elem, len);
virtio_notify(&port->vser->vdev, vq);
virtio_notify(&vser->vdev, vq);
return len;
}
static size_t send_control_event(VirtIOSerialPort *port, uint16_t event,
uint16_t value)
static size_t send_control_event(VirtIOSerial *vser, uint32_t port_id,
uint16_t event, uint16_t value)
{
struct virtio_console_control cpkt;
stl_p(&cpkt.id, port_id);
stw_p(&cpkt.event, event);
stw_p(&cpkt.value, value);
trace_virtio_serial_send_control_event(port->id, event, value);
return send_control_msg(port, &cpkt, sizeof(cpkt));
trace_virtio_serial_send_control_event(port_id, event, value);
return send_control_msg(vser, &cpkt, sizeof(cpkt));
}
/* Functions for use inside qemu to open and read from/write to ports */
@ -261,7 +259,7 @@ int virtio_serial_open(VirtIOSerialPort *port)
}
/* Send port open notification to the guest */
port->host_connected = true;
send_control_event(port, VIRTIO_CONSOLE_PORT_OPEN, 1);
send_control_event(port->vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 1);
return 0;
}
@ -276,7 +274,7 @@ int virtio_serial_close(VirtIOSerialPort *port)
port->throttled = false;
discard_vq_data(port->ovq, &port->vser->vdev);
send_control_event(port, VIRTIO_CONSOLE_PORT_OPEN, 0);
send_control_event(port->vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 0);
return 0;
}
@ -365,7 +363,7 @@ static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len)
* ports we have here.
*/
QTAILQ_FOREACH(port, &vser->ports, next) {
send_control_event(port, VIRTIO_CONSOLE_PORT_ADD, 1);
send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_ADD, 1);
}
return;
}
@ -396,10 +394,11 @@ static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len)
* up to hvc.
*/
if (vsc->is_console) {
send_control_event(port, VIRTIO_CONSOLE_CONSOLE_PORT, 1);
send_control_event(vser, port->id, VIRTIO_CONSOLE_CONSOLE_PORT, 1);
}
if (port->name) {
stl_p(&cpkt.id, port->id);
stw_p(&cpkt.event, VIRTIO_CONSOLE_PORT_NAME);
stw_p(&cpkt.value, 1);
@ -410,12 +409,12 @@ static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len)
memcpy(buffer + sizeof(cpkt), port->name, strlen(port->name));
buffer[buffer_len - 1] = 0;
send_control_msg(port, buffer, buffer_len);
send_control_msg(vser, buffer, buffer_len);
g_free(buffer);
}
if (port->host_connected) {
send_control_event(port, VIRTIO_CONSOLE_PORT_OPEN, 1);
send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 1);
}
/*
@ -655,7 +654,7 @@ static void virtio_serial_post_load_timer_cb(void *opaque)
* We have to let the guest know of the host connection
* status change
*/
send_control_event(port, VIRTIO_CONSOLE_PORT_OPEN,
send_control_event(s, port->id, VIRTIO_CONSOLE_PORT_OPEN,
port->host_connected);
}
}
@ -841,9 +840,7 @@ static void mark_port_added(VirtIOSerial *vser, uint32_t port_id)
static void add_port(VirtIOSerial *vser, uint32_t port_id)
{
mark_port_added(vser, port_id);
send_control_event(find_port_by_id(vser, port_id),
VIRTIO_CONSOLE_PORT_ADD, 1);
send_control_event(vser, port_id, VIRTIO_CONSOLE_PORT_ADD, 1);
}
static void remove_port(VirtIOSerial *vser, uint32_t port_id)
@ -858,7 +855,7 @@ static void remove_port(VirtIOSerial *vser, uint32_t port_id)
/* Flush out any unconsumed buffers first */
discard_vq_data(port->ovq, &port->vser->vdev);
send_control_event(port, VIRTIO_CONSOLE_PORT_REMOVE, 1);
send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_REMOVE, 1);
}
static int virtser_port_qdev_init(DeviceState *qdev)