From d81bcfcdadd17347a661d1379960d3144d2f69fa Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?= Date: Wed, 16 Dec 2015 05:22:24 +0100 Subject: [PATCH] xen-netfront: add range check for Tx response id MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Tx response ID is fetched from shared page, so make sure it is sane before using it as an array index. This is part of XSA155. CC: stable@vger.kernel.org Signed-off-by: Marek Marczykowski-Górecki --- 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 834a7950bea1..a429ab24114b 100644 --- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -392,6 +392,7 @@ 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)) { -- 2.20.1