From 2102e06a5f2e414694921f23591f072a5ba7db9f Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Wed, 4 Jul 2012 09:18:01 +0200 Subject: [PATCH] usbdevfs: Correct amount of data copied to user in processcompl_compat 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 Acked-by: Alan Stern CC: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/devio.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index e0f107948eba..62679bc031fb 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -1604,10 +1604,14 @@ 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)) -- 2.39.5