From 3ddf4f97bee674e72412d9b0a3be2695d80dad3a Mon Sep 17 00:00:00 2001 From: Vasiliy Kulikov Date: Sat, 6 Nov 2010 17:41:28 +0300 Subject: [PATCH] usb: core: fix information leak to userland commit 886ccd4520064408ce5876cfe00554ce52ecf4a7 upstream. Structure usbdevfs_connectinfo is copied to userland with padding byted after "slow" field uninitialized. It leads to leaking of contents of kernel stack memory. Signed-off-by: Vasiliy Kulikov Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/devio.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index 8657266f268b..a3397c8d68a4 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -883,10 +883,11 @@ static int proc_getdriver(struct dev_state *ps, void __user *arg) static int proc_connectinfo(struct dev_state *ps, void __user *arg) { - struct usbdevfs_connectinfo ci; + struct usbdevfs_connectinfo ci = { + .devnum = ps->dev->devnum, + .slow = ps->dev->speed == USB_SPEED_LOW + }; - ci.devnum = ps->dev->devnum; - ci.slow = ps->dev->speed == USB_SPEED_LOW; if (copy_to_user(arg, &ci, sizeof(ci))) return -EFAULT; return 0; -- 2.39.2