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usb-hub: limit chain length 

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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1
hw/usb.h
View File

@ -337,6 +337,7 @@ typedef struct USBPortOps {
struct USBPort {
USBDevice *dev;
int speedmask;
int hubcount;
char path[16];
USBPortOps *ops;
void *opaque;

2
hw/usb/bus.c
View File

@ -341,8 +341,10 @@ void usb_port_location(USBPort *downstream, USBPort *upstream, int portnr)
if (upstream) {
snprintf(downstream->path, sizeof(downstream->path), "%s.%d",
upstream->path, portnr);
downstream->hubcount = upstream->hubcount + 1;
} else {
snprintf(downstream->path, sizeof(downstream->path), "%d", portnr);
downstream->hubcount = 0;
}
}

6
hw/usb/dev-hub.c
View File

@ -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);