[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@vger.kernel.org Signed-off-by: Marek Marczykowski-Górecki marmarek@invisiblethingslab.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)) {