Patch "can: cc770: Fix use after free in cc770_tx_interrupt()" has been added to the 4.9-stable tree

Patch "can: cc770: Fix use after free in cc770_tx_interrupt()" has been added to the 4.9-stable tree

[gregkh]

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

    can: cc770: Fix use after free in cc770_tx_interrupt()

to the 4.9-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:
     can-cc770-fix-use-after-free-in-cc770_tx_interrupt.patch
and it can be found in the queue-4.9 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 9ffd7503944ec7c0ef41c3245d1306c221aef2be Mon Sep 17 00:00:00 2001
From: Andri Yngvason <andri.yngvason@marel.com>
Date: Thu, 15 Mar 2018 18:23:17 +0000
Subject: can: cc770: Fix use after free in cc770_tx_interrupt()

From: Andri Yngvason <andri.yngvason@marel.com>

commit 9ffd7503944ec7c0ef41c3245d1306c221aef2be upstream.

This fixes use after free introduced by the last cc770 patch.

Signed-off-by: Andri Yngvason <andri.yngvason@marel.com>
Fixes: 746201235b3f ("can: cc770: Fix queue stall & dropped RTR reply")
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/can/cc770/cc770.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/net/can/cc770/cc770.c
+++ b/drivers/net/can/cc770/cc770.c
@@ -706,13 +706,12 @@ static void cc770_tx_interrupt(struct ne
 		return;
 	}
 
-	can_put_echo_skb(priv->tx_skb, dev, 0);
-	can_get_echo_skb(dev, 0);
-
 	cf = (struct can_frame *)priv->tx_skb->data;
 	stats->tx_bytes += cf->can_dlc;
 	stats->tx_packets++;
 
+	can_put_echo_skb(priv->tx_skb, dev, 0);
+	can_get_echo_skb(dev, 0);
 	priv->tx_skb = NULL;
 
 	netif_wake_queue(dev);


Patches currently in stable-queue which might be from andri.yngvason@marel.com are

queue-4.9/can-cc770-fix-use-after-free-in-cc770_tx_interrupt.patch
queue-4.9/can-cc770-fix-queue-stall-dropped-rtr-reply.patch
queue-4.9/can-cc770-fix-stalls-on-rt-linux-remove-redundant-irq-ack.patch