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usb: usb_get_configuration() obeys authorization

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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 <inaky@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Inaky Perez-Gonzalez 2007-07-31 20:34:02 -07:00 committed by Greg Kroah-Hartman
parent 16bbab2966
commit 1145065cd0
1 changed files with 19 additions and 5 deletions
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24
drivers/usb/core/config.c
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@ -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) int usb_get_configuration(struct usb_device *dev)
{ {
struct device *ddev = &dev->dev; struct device *ddev = &dev->dev;
int ncfg = dev->descriptor.bNumConfigurations; int ncfg = dev->descriptor.bNumConfigurations;
int result = -ENOMEM; int result = 0;
unsigned int cfgno, length; unsigned int cfgno, length;
unsigned char *buffer; unsigned char *buffer;
unsigned char *bigbuffer; unsigned char *bigbuffer;
struct usb_config_descriptor *desc; 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) { if (ncfg > USB_MAXCONFIG) {
dev_warn(ddev, "too many configurations: %d, " dev_warn(ddev, "too many configurations: %d, "
"using maximum allowed: %d\n", ncfg, USB_MAXCONFIG); "using maximum allowed: %d\n", ncfg, USB_MAXCONFIG);
@ -545,14 +557,15 @@ int usb_get_configuration(struct usb_device *dev)
goto err2; goto err2;
desc = (struct usb_config_descriptor *)buffer; 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 /* We grab just the first descriptor so we know how long
* the whole configuration is */ * the whole configuration is */
result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
buffer, USB_DT_CONFIG_SIZE); buffer, USB_DT_CONFIG_SIZE);
if (result < 0) { if (result < 0) {
dev_err(ddev, "unable to read config index %d " 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_err(ddev, "chopping to %d config(s)\n", cfgno);
dev->descriptor.bNumConfigurations = cfgno; dev->descriptor.bNumConfigurations = cfgno;
break; break;
@ -599,6 +612,7 @@ int usb_get_configuration(struct usb_device *dev)
err: err:
kfree(buffer); kfree(buffer);
out_not_authorized:
dev->descriptor.bNumConfigurations = cfgno; dev->descriptor.bNumConfigurations = cfgno;
err2: err2:
if (result == -ENOMEM) if (result == -ENOMEM)