[SRU][F][PATCH 1/1] net: ena: Fix incorrect descriptor free behavior

[Tim Whisonant]

From: David Arinzon <darinzon at amazon.com>

CVE-2024-35958

ENA has two types of TX queues:
- queues which only process TX packets arriving from the network stack
- queues which only process TX packets forwarded to it by XDP_REDIRECT
  or XDP_TX instructions

The ena_free_tx_bufs() cycles through all descriptors in a TX queue
and unmaps + frees every descriptor that hasn't been acknowledged yet
by the device (uncompleted TX transactions).
The function assumes that the processed TX queue is necessarily from
the first category listed above and ends up using napi_consume_skb()
for descriptors belonging to an XDP specific queue.

This patch solves a bug in which, in case of a VF reset, the
descriptors aren't freed correctly, leading to crashes.

Fixes: 548c4940b9f1 ("net: ena: Implement XDP_TX action")
Signed-off-by: Shay Agroskin <shayagr at amazon.com>
Signed-off-by: David Arinzon <darinzon at amazon.com>
Reviewed-by: Shannon Nelson <shannon.nelson at amd.com>
Signed-off-by: Paolo Abeni <pabeni at redhat.com>
(cherry picked from commit bf02d9fe00632d22fa91d34749c7aacf397b6cde)
CVE-2024-35958
Signed-off-by: Tim Whisonant <tim.whisonant at canonical.com>
---
 drivers/net/ethernet/amazon/ena/ena_netdev.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index 20ad992f47f3..7beb081a8550 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -1110,8 +1110,11 @@ static void ena_unmap_tx_buff(struct ena_ring *tx_ring,
 static void ena_free_tx_bufs(struct ena_ring *tx_ring)
 {
 	bool print_once = true;
+	bool is_xdp_ring;
 	u32 i;
 
+	is_xdp_ring = ENA_IS_XDP_INDEX(tx_ring->adapter, tx_ring->qid);
+
 	for (i = 0; i < tx_ring->ring_size; i++) {
 		struct ena_tx_buffer *tx_info = &tx_ring->tx_buffer_info[i];
 
@@ -1131,10 +1134,15 @@ static void ena_free_tx_bufs(struct ena_ring *tx_ring)
 
 		ena_unmap_tx_buff(tx_ring, tx_info);
 
-		dev_kfree_skb_any(tx_info->skb);
+		if (is_xdp_ring)
+			xdp_return_frame(tx_info->xdpf);
+		else
+			dev_kfree_skb_any(tx_info->skb);
 	}
-	netdev_tx_reset_queue(netdev_get_tx_queue(tx_ring->netdev,
-						  tx_ring->qid));
+
+	if (!is_xdp_ring)
+		netdev_tx_reset_queue(netdev_get_tx_queue(tx_ring->netdev,
+							  tx_ring->qid));
 }
 
 static void ena_free_all_tx_bufs(struct ena_adapter *adapter)
-- 
2.43.0