releases/4.7.3/usb-serial-mos7720-fix-non-atomic-allocation-in-write-path.patch

   1 From 5a5a1d614287a647b36dff3f40c2b0ceabbc83ec Mon Sep 17 00:00:00 2001
   2 From: Alexey Khoroshilov <khoroshilov@ispras.ru>
   3 Date: Fri, 12 Aug 2016 01:05:08 +0300
   4 Subject: USB: serial: mos7720: fix non-atomic allocation in write path
   5
   6 From: Alexey Khoroshilov <khoroshilov@ispras.ru>
   7
   8 commit 5a5a1d614287a647b36dff3f40c2b0ceabbc83ec upstream.
   9
  10 There is an allocation with GFP_KERNEL flag in mos7720_write(),
  11 while it may be called from interrupt context.
  12
  13 Follow-up for commit 191252837626 ("USB: kobil_sct: fix non-atomic
  14 allocation in write path")
  15
  16 Found by Linux Driver Verification project (linuxtesting.org).
  17
  18 Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
  19 Signed-off-by: Johan Hovold <johan@kernel.org>
  20 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  21
  22 ---
  23  drivers/usb/serial/mos7720.c |    2 +-
  24  1 file changed, 1 insertion(+), 1 deletion(-)
  25
  26 --- a/drivers/usb/serial/mos7720.c
  27 +++ b/drivers/usb/serial/mos7720.c
  28 @@ -1252,7 +1252,7 @@ static int mos7720_write(struct tty_stru
  29
  30         if (urb->transfer_buffer == NULL) {
  31                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
  32 -                                              GFP_KERNEL);
  33 +                                              GFP_ATOMIC);
  34                 if (!urb->transfer_buffer)
  35                         goto exit;
  36         }