usbdevfs: Correct amount of data copied to user in processcompl_compat

commit 2102e06a5f2e414694921f23591f072a5ba7db9f upstream.

iso data buffers may have holes in them if some packets were short, so for
iso urbs we should always copy the entire buffer, just like the regular
processcompl does.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index f6ff837..a9df218 100644 (file)
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -1555,10 +1555,14 @@ static int processcompl_compat(struct async *as, void __user * __user *arg)
        void __user *addr = as->userurb;
        unsigned int i;
 
-       if (as->userbuffer && urb->actual_length)
-               if (copy_to_user(as->userbuffer, urb->transfer_buffer,
-                                urb->actual_length))
+       if (as->userbuffer && urb->actual_length) {
+               if (urb->number_of_packets > 0)         /* Isochronous */
+                       i = urb->transfer_buffer_length;
+               else                                    /* Non-Isoc */
+                       i = urb->actual_length;
+               if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
                        return -EFAULT;
+       }
        if (put_user(as->status, &userurb->status))
                return -EFAULT;
        if (put_user(urb->actual_length, &userurb->actual_length))