devio allows to mmap memory regions and keeps them in a list. It also accepts a user address through an ioctl call and searches the memory region list for the region that contains this address. Since the addresses provided to mmap must not be tagged, and the addresses provided to ioctl might be tagged, we might compare tagged and untagged addresses during the search.
Untag the provided addresses before searching.
Signed-off-by: Andrey Konovalov andreyknvl@google.com --- drivers/usb/core/devio.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index 476dcc5f2da3..357c2e7b87b8 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -1404,7 +1404,7 @@ find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb) { struct usb_memory *usbm = NULL, *iter; unsigned long flags; - unsigned long uurb_start = (unsigned long)uurb->buffer; + unsigned long uurb_start = (unsigned long)untagged_addr(uurb->buffer);
spin_lock_irqsave(&ps->lock, flags); list_for_each_entry(iter, &ps->memory_list, memlist) { @@ -1633,7 +1633,8 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb } } else if (uurb->buffer_length > 0) { if (as->usbm) { - unsigned long uurb_start = (unsigned long)uurb->buffer; + unsigned long uurb_start = + (unsigned long)untagged_addr(uurb->buffer);
as->urb->transfer_buffer = as->usbm->mem + (uurb_start - as->usbm->vm_start); @@ -1712,7 +1713,8 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb as->ps = ps; as->userurb = arg; if (as->usbm) { - unsigned long uurb_start = (unsigned long)uurb->buffer; + unsigned long uurb_start = + (unsigned long)untagged_addr(uurb->buffer);
as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; as->urb->transfer_dma = as->usbm->dma_handle +