From: Inaky Perez-Gonzalez Date: Wed, 1 Aug 2007 03:34:02 +0000 (-0700) Subject: usb: usb_get_configuration() obeys authorization X-Git-Tag: v2.6.24-rc1~1395^2~111 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1145065cd0434b0fd5cd7c0efe0f1438fb154ed0;p=linux-2.6 usb: usb_get_configuration() obeys authorization If called and the device is not authorized to be used, then we don't allow reading the configurations. Signed-off-by: Inaky Perez-Gonzalez Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c index cb69aa1e02..1a8edcee7f 100644 --- a/drivers/usb/core/config.c +++ b/drivers/usb/core/config.c @@ -507,18 +507,30 @@ void usb_destroy_configuration(struct usb_device *dev) } -// hub-only!! ... and only in reset path, or usb_new_device() -// (used by real hubs and virtual root hubs) +/* + * Get the USB config descriptors, cache and parse'em + * + * hub-only!! ... and only in reset path, or usb_new_device() + * (used by real hubs and virtual root hubs) + * + * NOTE: if this is a WUSB device and is not authorized, we skip the + * whole thing. A non-authorized USB device has no + * configurations. + */ int usb_get_configuration(struct usb_device *dev) { struct device *ddev = &dev->dev; int ncfg = dev->descriptor.bNumConfigurations; - int result = -ENOMEM; + int result = 0; unsigned int cfgno, length; unsigned char *buffer; unsigned char *bigbuffer; struct usb_config_descriptor *desc; + cfgno = 0; + if (dev->authorized == 0) /* Not really an error */ + goto out_not_authorized; + result = -ENOMEM; if (ncfg > USB_MAXCONFIG) { dev_warn(ddev, "too many configurations: %d, " "using maximum allowed: %d\n", ncfg, USB_MAXCONFIG); @@ -545,14 +557,15 @@ int usb_get_configuration(struct usb_device *dev) goto err2; desc = (struct usb_config_descriptor *)buffer; - for (cfgno = 0; cfgno < ncfg; cfgno++) { + result = 0; + for (; cfgno < ncfg; cfgno++) { /* We grab just the first descriptor so we know how long * the whole configuration is */ result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, USB_DT_CONFIG_SIZE); if (result < 0) { dev_err(ddev, "unable to read config index %d " - "descriptor/%s\n", cfgno, "start"); + "descriptor/%s: %d\n", cfgno, "start", result); dev_err(ddev, "chopping to %d config(s)\n", cfgno); dev->descriptor.bNumConfigurations = cfgno; break; @@ -599,6 +612,7 @@ int usb_get_configuration(struct usb_device *dev) err: kfree(buffer); +out_not_authorized: dev->descriptor.bNumConfigurations = cfgno; err2: if (result == -ENOMEM)