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virtio-serial: Check if more max_ports specified than we can handle

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Currently virtio-serial supports a maximum of 31 ports. Specifying the
'max_ports' parameter to be > 31 on the cmd line causes badness.

Ensure we initialise virtio-serial only if max_ports is within the
supported range.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Amit Shah 2010-07-21 15:08:30 +05:30 committed by Aurelien Jarno
parent cdc6f54200
commit 5ab4bb598d
1 changed files with 9 additions and 1 deletions
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10
hw/virtio-serial-bus.c
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@ -734,11 +734,19 @@ VirtIODevice *virtio_serial_init(DeviceState *dev, uint32_t max_nr_ports)
{
VirtIOSerial *vser;
VirtIODevice *vdev;
uint32_t i;
uint32_t i, max_supported_ports;
if (!max_nr_ports)
return NULL;
/* Each port takes 2 queues, and one pair is for the control queue */
max_supported_ports = VIRTIO_PCI_QUEUE_MAX / 2 - 1;
if (max_nr_ports > max_supported_ports) {
error_report("maximum ports supported: %u", max_supported_ports);
return NULL;
}
vdev = virtio_common_init("virtio-serial", VIRTIO_ID_CONSOLE,
sizeof(struct virtio_console_config),
sizeof(VirtIOSerial));