[PATCH v3 2/2] usb: core: Remove redundant vmap checks

From: Kees Cook
Date: Thu Oct 10 2019 - 18:28:58 EST


Now that the vmap area checks are being performed in the DMA
infrastructure directly, there is no need to repeat them in USB.

Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
drivers/usb/core/hcd.c | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index f225eaa98ff8..281568d464f9 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1410,10 +1410,7 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
if (hcd->self.uses_pio_for_control)
return ret;
if (hcd_uses_dma(hcd)) {
- if (is_vmalloc_addr(urb->setup_packet)) {
- WARN_ONCE(1, "setup packet is not dma capable\n");
- return -EAGAIN;
- } else if (object_is_on_stack(urb->setup_packet)) {
+ if (object_is_on_stack(urb->setup_packet)) {
WARN_ONCE(1, "setup packet is on stack\n");
return -EAGAIN;
}
@@ -1479,9 +1476,6 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
ret = -EAGAIN;
else
urb->transfer_flags |= URB_DMA_MAP_PAGE;
- } else if (is_vmalloc_addr(urb->transfer_buffer)) {
- WARN_ONCE(1, "transfer buffer not dma capable\n");
- ret = -EAGAIN;
} else if (object_is_on_stack(urb->transfer_buffer)) {
WARN_ONCE(1, "transfer buffer is on stack\n");
ret = -EAGAIN;
--
2.17.1