Patch "USB: serial: mos7840: fix non-atomic allocation in write path" has been added to the 3.14-stable tree

Patch "USB: serial: mos7840: fix non-atomic allocation in write path" has been added to the 3.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    USB: serial: mos7840: fix non-atomic allocation in write path

to the 3.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-serial-mos7840-fix-non-atomic-allocation-in-write-path.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 3b7c7e52efda0d4640060de747768360ba70a7c0 Mon Sep 17 00:00:00 2001
From: Alexey Khoroshilov <khoroshilov@ispras.ru>
Date: Fri, 12 Aug 2016 01:05:09 +0300
Subject: USB: serial: mos7840: fix non-atomic allocation in write path

From: Alexey Khoroshilov <khoroshilov@ispras.ru>

commit 3b7c7e52efda0d4640060de747768360ba70a7c0 upstream.

There is an allocation with GFP_KERNEL flag in mos7840_write(),
while it may be called from interrupt context.

Follow-up for commit 191252837626 ("USB: kobil_sct: fix non-atomic
allocation in write path")

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/serial/mos7840.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -1372,8 +1372,8 @@ static int mos7840_write(struct tty_stru
 	}
 
 	if (urb->transfer_buffer == NULL) {
-		urb->transfer_buffer =
-		    kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
+		urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
+					       GFP_ATOMIC);
 		if (!urb->transfer_buffer)
 			goto exit;
 	}


Patches currently in stable-queue which might be from khoroshilov@ispras.ru are

queue-3.14/usb-serial-mos7840-fix-non-atomic-allocation-in-write-path.patch
queue-3.14/usb-serial-mos7720-fix-non-atomic-allocation-in-write-path.patch