linux-kernel - [PATCH 3.12 032/119] USB: serial: mos7720: fix non-atomic allocation in write path

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Message-Id: <8eb8f07bf70fcbbce1ac985ca32bbee15b3d4f53.1475144721.git.jslaby@suse.cz>
Date:   Thu, 29 Sep 2016 12:24:28 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Alexey Khoroshilov <khoroshilov@...ras.ru>,
        Johan Hovold <johan@...nel.org>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 032/119] USB: serial: mos7720: fix non-atomic allocation in write path

From: Alexey Khoroshilov <khoroshilov@...ras.ru>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 5a5a1d614287a647b36dff3f40c2b0ceabbc83ec upstream.

There is an allocation with GFP_KERNEL flag in mos7720_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@...ras.ru>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/usb/serial/mos7720.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index 84657e07dc5d..d40e1dccb998 100644
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -1249,7 +1249,7 @@ static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
 
 	if (urb->transfer_buffer == NULL) {
 		urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
-					       GFP_KERNEL);
+					       GFP_ATOMIC);
 		if (urb->transfer_buffer == NULL) {
 			dev_err_console(port, "%s no more kernel memory...\n",
 				__func__);
-- 
2.10.0