[PATCH 4.9 112/199] usb: core: urb: fix URB structure initialization function

[Greg Kroah-Hartman]

From: Emiliano Ingrassia <ingrassia@xxxxxxxxxxxxxx>

commit 1cd17f7f0def31e3695501c4f86cd3faf8489840 upstream.

Explicitly initialize URB structure urb_list field in usb_init_urb().
This field can be potentially accessed uninitialized and its
initialization is coherent with the usage of list_del_init() in
usb_hcd_unlink_urb_from_ep() and usb_giveback_urb_bh() and its
explicit initialization in usb_hcd_submit_urb() error path.

Signed-off-by: Emiliano Ingrassia <ingrassia@xxxxxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20191127160355.GA27196@xxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/core/urb.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -40,6 +40,7 @@ void usb_init_urb(struct urb *urb)
 	if (urb) {
 		memset(urb, 0, sizeof(*urb));
 		kref_init(&urb->kref);
+		INIT_LIST_HEAD(&urb->urb_list);
 		INIT_LIST_HEAD(&urb->anchor_list);
 	}
 }