netdev - [PATCH 4/6] xen-netfront: add range check for Tx response id

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Date:   Mon, 30 Apr 2018 23:01:48 +0200
From:   Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>
To:     xen-devel@...ts.xenproject.org
Cc:     Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>, stable@...r.kernel.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        netdev@...r.kernel.org (open list:NETWORKING DRIVERS),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 4/6] xen-netfront: add range check for Tx response id

Tx response ID is fetched from shared page, so make sure it is sane
before using it as an array index.

CC: stable@...r.kernel.org
Signed-off-by: Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com>
---
 drivers/net/xen-netfront.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 934b8a4..55c9b25 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -394,6 +394,7 @@ static void xennet_tx_buf_gc(struct netfront_queue *queue)
 				continue;
 
 			id  = txrsp.id;
+			BUG_ON(id >= NET_TX_RING_SIZE);
 			skb = queue->tx_skbs[id].skb;
 			if (unlikely(gnttab_query_foreign_access(
 				queue->grant_tx_ref[id]) != 0)) {
-- 
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