diff options
| author | Josef Gajdusek <atx@atx.name> | 2014-10-09 15:47:54 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-03 15:34:00 -0800 |
| commit | e50a322e517731de5d1f6f3aad0a73f3b506c5ea (patch) | |
| tree | b7cd7b8f14db325687649f08fe4ba4d7298eead7 /drivers/usb/core | |
| parent | dd3cf17488b102092014e517b4f18f24e5e3d4aa (diff) | |
usb: Do not re-read descriptors for wired devices in usb_authorize_device()
This patch modifies the usb_authorize_device() function such as that it does
not reload the device descriptor for wired devices. The reasons for this
are as follows:
* Some devices dislike the master requesting the descriptor from them twice,
failing on the usb_get_device_descriptor() call with -ETIMEOUT. Observed this
on my Pretec 16GB flash drive (4146:ba65).
* Malicious device could send two different descriptors - one before
authorization, used by userspace to determine whether to authorize it and
second to be actually used by the kernel when determining which drivers to
bind.
Signed-off-by: Josef Gajdusek <atx@atx.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/hub.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 11e80ac31324..c096a1a135cc 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -2543,11 +2543,14 @@ int usb_authorize_device(struct usb_device *usb_dev) "can't autoresume for authorization: %d\n", result); goto error_autoresume; } - result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); - if (result < 0) { - dev_err(&usb_dev->dev, "can't re-read device descriptor for " - "authorization: %d\n", result); - goto error_device_descriptor; + + if (usb_dev->wusb) { + result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); + if (result < 0) { + dev_err(&usb_dev->dev, "can't re-read device descriptor for " + "authorization: %d\n", result); + goto error_device_descriptor; + } } usb_dev->authorized = 1; |