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authorInaky Perez-Gonzalez <inaky@linux.intel.com>2007-07-31 20:34:02 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2007-10-12 14:55:06 -0700
commit1145065cd0434b0fd5cd7c0efe0f1438fb154ed0 (patch)
treeb124106b43b5b4c656111952200b8b061e685b5c /drivers/usb/core
parent16bbab2966309ae82cda3d378964c56096d4858c (diff)
downloadop-kernel-dev-1145065cd0434b0fd5cd7c0efe0f1438fb154ed0.zip
op-kernel-dev-1145065cd0434b0fd5cd7c0efe0f1438fb154ed0.tar.gz
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 <inaky@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core')
-rw-r--r--drivers/usb/core/config.c24
1 files changed, 19 insertions, 5 deletions
diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c
index cb69aa1..1a8edce 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)
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