diff options
| author | Oliver Neukum <oliver@neukum.org> | 2009-04-20 17:24:49 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-04-23 14:15:30 -0700 |
| commit | 052fbc0d7f76106725c998183d64dcacecd21f8f (patch) | |
| tree | 0771141a48c604ddbfdd1dca3a19bf2c37523876 /drivers | |
| parent | 2400a2bfbd0e912193fe3b077f492d4980141813 (diff) | |
USB: correct error handling in cdc-wdm
This patch to cdc-wdm
- checks for partial extra descriptors
- fixes a leak in the error case of probe
- checks for an exact number of endpoints
- adds a clarifying comment
Signed-off-by: Oliver Neukum <oliver@neukum.org>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/class/cdc-wdm.c | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c index 34e6108e1d42..0fe434505ac4 100644 --- a/drivers/usb/class/cdc-wdm.c +++ b/drivers/usb/class/cdc-wdm.c @@ -3,7 +3,7 @@ * * This driver supports USB CDC WCM Device Management. * - * Copyright (c) 2007-2008 Oliver Neukum + * Copyright (c) 2007-2009 Oliver Neukum * * Some code taken from cdc-acm.c * @@ -610,7 +610,7 @@ static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) if (!buffer) goto out; - while (buflen > 0) { + while (buflen > 2) { if (buffer [1] != USB_DT_CS_INTERFACE) { dev_err(&intf->dev, "skipping garbage\n"); goto next_desc; @@ -646,16 +646,18 @@ next_desc: spin_lock_init(&desc->iuspin); init_waitqueue_head(&desc->wait); desc->wMaxCommand = maxcom; + /* this will be expanded and needed in hardware endianness */ desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber); desc->intf = intf; INIT_WORK(&desc->rxwork, wdm_rxwork); - iface = &intf->altsetting[0]; + rv = -EINVAL; + iface = intf->cur_altsetting; + if (iface->desc.bNumEndpoints != 1) + goto err; ep = &iface->endpoint[0].desc; - if (!ep || !usb_endpoint_is_int_in(ep)) { - rv = -EINVAL; + if (!ep || !usb_endpoint_is_int_in(ep)) goto err; - } desc->wMaxPacketSize = le16_to_cpu(ep->wMaxPacketSize); desc->bMaxPacketSize0 = udev->descriptor.bMaxPacketSize0; @@ -711,12 +713,19 @@ next_desc: usb_set_intfdata(intf, desc); rv = usb_register_dev(intf, &wdm_class); - dev_info(&intf->dev, "cdc-wdm%d: USB WDM device\n", - intf->minor - WDM_MINOR_BASE); if (rv < 0) - goto err; + goto err3; + else + dev_info(&intf->dev, "cdc-wdm%d: USB WDM device\n", + intf->minor - WDM_MINOR_BASE); out: return rv; +err3: + usb_set_intfdata(intf, NULL); + usb_buffer_free(interface_to_usbdev(desc->intf), + desc->bMaxPacketSize0, + desc->inbuf, + desc->response->transfer_dma); err2: usb_buffer_free(interface_to_usbdev(desc->intf), desc->wMaxPacketSize, |