USB supports up to 5 hubs chained.
Catch attempts to chain more.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
struct USBPort {
USBDevice *dev;
int speedmask;
+ int hubcount;
char path[16];
USBPortOps *ops;
void *opaque;
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;
}
}
#include "trace.h"
#include "hw/usb.h"
#include "hw/usb/desc.h"
+#include "qemu/error-report.h"
#define NUM_PORTS 8
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);