diff options
| author | Felipe Balbi <balbi@ti.com> | 2013-07-02 10:50:15 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-25 11:49:30 -0700 |
| commit | 42189d854f174e7b29e0fdb4da9984ba63126a92 (patch) | |
| tree | a8f825986d951260305433938aa1e431df4fa2d2 /include/linux | |
| parent | afb8aae89890e65bd4b828de38bd430d4f31caa8 (diff) | |
| download | lwn-42189d854f174e7b29e0fdb4da9984ba63126a92.tar.gz lwn-42189d854f174e7b29e0fdb4da9984ba63126a92.zip | |
usb: clamp bInterval to allowed range
bInterval must be within the range 1 - 16
when running at High/Super speed, and within
the range 1 - 255 when running at Full/Low speed.
In order to catch drivers passing a too
large bInterval on Super/High speed scenarios
(thus overflowing urb->interval), let's clamp()
the argument to the allowed ranges.
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/usb.h | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/include/linux/usb.h b/include/linux/usb.h index e99b2a114af4..eb4252a0da7e 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -1547,10 +1547,16 @@ static inline void usb_fill_int_urb(struct urb *urb, urb->transfer_buffer_length = buffer_length; urb->complete = complete_fn; urb->context = context; - if (dev->speed == USB_SPEED_HIGH || dev->speed == USB_SPEED_SUPER) + + if (dev->speed == USB_SPEED_HIGH || dev->speed == USB_SPEED_SUPER) { + /* make sure interval is within allowed range */ + interval = clamp(interval, 1, 16); + urb->interval = 1 << (interval - 1); - else + } else { urb->interval = interval; + } + urb->start_frame = -1; } |