diff options
| author | Felipe Balbi <felipe.balbi@nokia.com> | 2008-06-12 10:49:47 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-07-21 15:16:26 -0700 |
| commit | 38f3ad5e7463d4dd490a8081a5f3f9f2dec7ecd6 (patch) | |
| tree | 2dd60da46d065e4df9e34fe031d13e38bfc22dff /drivers/usb | |
| parent | 6deb270b5c60680ca9117bd545302ea6a58bad42 (diff) | |
usb: hub: add check for unsupported bus topology
We can't allow hubs on the 7th tier as they would allow
devices on the 8th tier.
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/core/devices.c | 2 | ||||
| -rw-r--r-- | drivers/usb/core/hcd.h | 2 | ||||
| -rw-r--r-- | drivers/usb/core/hub.c | 6 |
3 files changed, 8 insertions, 2 deletions
diff --git a/drivers/usb/core/devices.c b/drivers/usb/core/devices.c index a681d9b92bd..6ec38175a81 100644 --- a/drivers/usb/core/devices.c +++ b/drivers/usb/core/devices.c @@ -61,8 +61,6 @@ #include "usb.h" #include "hcd.h" -#define MAX_TOPO_LEVEL 6 - /* Define ALLOW_SERIAL_NUMBER if you want to see the serial number of devices */ #define ALLOW_SERIAL_NUMBER diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h index 50b8bb2d121..5b0b59b0d89 100644 --- a/drivers/usb/core/hcd.h +++ b/drivers/usb/core/hcd.h @@ -21,6 +21,8 @@ #include <linux/rwsem.h> +#define MAX_TOPO_LEVEL 6 + /* This file contains declarations of usbcore internals that are mostly * used or exposed by Host Controller Drivers. */ diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index e678ed8bd8c..3251120b414 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -1051,6 +1051,12 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) desc = intf->cur_altsetting; hdev = interface_to_usbdev(intf); + if (hdev->level == MAX_TOPO_LEVEL) { + dev_err(&intf->dev, "Unsupported bus topology: " + "hub nested too deep\n"); + return -E2BIG; + } + #ifdef CONFIG_USB_OTG_BLACKLIST_HUB if (hdev->parent) { dev_warn(&intf->dev, "ignoring external hub\n"); |