linux-kernel - [PATCH 5.4 81/92] can: ucan: fix non-atomic allocation in completion handler

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Message-Id: <20191211150300.171772638@linuxfoundation.org>
Date:   Wed, 11 Dec 2019 16:06:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Jakob Unterwurzacher <jakob.unterwurzacher@...obroma-systems.com>,
        Martin Elshuber <martin.elshuber@...obroma-systems.com>,
        Philipp Tomsich <philipp.tomsich@...obroma-systems.com>,
        Johan Hovold <johan@...nel.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 5.4 81/92] can: ucan: fix non-atomic allocation in completion handler

From: Johan Hovold <johan@...nel.org>

commit 870db5d1015c8bd63e93b579e857223c96249ff7 upstream.

USB completion handlers are called in atomic context and must
specifically not allocate memory using GFP_KERNEL.

Fixes: 9f2d3eae88d2 ("can: ucan: add driver for Theobroma Systems UCAN devices")
Cc: stable <stable@...r.kernel.org>     # 4.19
Cc: Jakob Unterwurzacher <jakob.unterwurzacher@...obroma-systems.com>
Cc: Martin Elshuber <martin.elshuber@...obroma-systems.com>
Cc: Philipp Tomsich <philipp.tomsich@...obroma-systems.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/can/usb/ucan.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/can/usb/ucan.c
+++ b/drivers/net/can/usb/ucan.c
@@ -792,7 +792,7 @@ resubmit:
 			  up);
 
 	usb_anchor_urb(urb, &up->rx_urbs);
-	ret = usb_submit_urb(urb, GFP_KERNEL);
+	ret = usb_submit_urb(urb, GFP_ATOMIC);
 
 	if (ret < 0) {
 		netdev_err(up->netdev,