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

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

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

CC: stable@xxxxxxxxxxxxxxx
Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
---
 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)) {
-- 
git-series 0.9.1

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