From 9d02b42614149ebccf12c9c580601ed01bd83070 Mon Sep 17 00:00:00 2001 From: Michal Sojka Date: Tue, 15 Mar 2011 16:41:47 +0100 Subject: [PATCH] USB: Do not pass negative length to snoop_urb() When `echo Y > /sys/module/usbcore/parameters/usbfs_snoop` and usb_control_msg() returns error, a lot of kernel memory is dumped to dmesg until unhandled kernel paging request occurs. Signed-off-by: Michal Sojka Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/devio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index a7131ad630f9..37518dfdeb98 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -802,7 +802,7 @@ static int proc_control(struct dev_state *ps, void __user *arg) tbuf, ctrl.wLength, tmo); usb_lock_device(dev); snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, - tbuf, i); + tbuf, max(i, 0)); if ((i > 0) && ctrl.wLength) { if (copy_to_user(ctrl.data, tbuf, i)) { free_page((unsigned long)tbuf); -- 2.39.2