From: Oleg Nesterov <oleg@tv-sign.ru>

usbatm_do_heavy_init() calls allow_signal() which plays with parent process's
->sighand.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Duncan Sands <duncan.sands@free.fr>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/usb/atm/usbatm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN drivers/usb/atm/usbatm.c~usbatm_heavy_init-dont-use-clone_sighand drivers/usb/atm/usbatm.c
--- a/drivers/usb/atm/usbatm.c~usbatm_heavy_init-dont-use-clone_sighand
+++ a/drivers/usb/atm/usbatm.c
@@ -1033,7 +1033,7 @@ static int usbatm_do_heavy_init(void *ar
 
 static int usbatm_heavy_init(struct usbatm_data *instance)
 {
-	int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_KERNEL);
+	int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_FS | CLONE_FILES);
 
 	if (ret < 0) {
 		usb_err(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret);
_