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usb-hub: limit chain length

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USB supports up to 5 hubs chained.
Catch attempts to chain more.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2013-03-20 11:40:02 +01:00
parent 4b7b2afae7
commit c24e4aac3b
3 changed files with 9 additions and 0 deletions
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6
hw/usb/dev-hub.c
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@ -25,6 +25,7 @@
#include "trace.h"
#include "hw/usb.h"
#include "hw/usb/desc.h"
#include "qemu/error-report.h"
#define NUM_PORTS 8
@ -514,6 +515,11 @@ static int usb_hub_initfn(USBDevice *dev)
USBHubPort *port;
int i;
if (dev->port->hubcount == 5) {
error_report("usb hub chain too deep");
return -1;
}
usb_desc_create_serial(dev);
usb_desc_init(dev);
s->intr = usb_ep_get(dev, USB_TOKEN_IN, 1);