linux-kernel - [PATCH 4.9 47/67] can: cc770: Fix use after free in cc770_tx

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Message-Id: <20180327162729.842500777@linuxfoundation.org>
Date:   Tue, 27 Mar 2018 18:27:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andri Yngvason <andri.yngvason@...el.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 4.9 47/67] can: cc770: Fix use after free in cc770_tx_interrupt()

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

------------------

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

commit 9ffd7503944ec7c0ef41c3245d1306c221aef2be upstream.

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

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