From: Arthur Kiyanovski <akiyano@xxxxxxxxxx>
[ Upstream commit 30623e1ed116bcd1785217d0a98eec643687e091 ]
Rx req_id is an index in struct ena_eth_io_rx_cdesc_base.
The driver should validate that the Rx req_id it received from
the device is in range [0, ring_size -1]. Failure to do so could
yield to potential memory access violoation.
The validation was mistakenly done when refilling
the Rx submission queue and not in Rx completion queue.
Fixes: ad974baef2a1 ("net: ena: add support for out of order rx buffers refill")
Signed-off-by: Noam Dagan <ndagan@xxxxxxxxxx>
Signed-off-by: Arthur Kiyanovski <akiyano@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/amazon/ena/ena_netdev.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -532,13 +532,9 @@ static int ena_refill_rx_bufs(struct ena
struct ena_rx_buffer *rx_info;
req_id = rx_ring->free_ids[next_to_use];
- rc = validate_rx_req_id(rx_ring, req_id);
- if (unlikely(rc < 0))
- break;
rx_info = &rx_ring->rx_buffer_info[req_id];
-
rc = ena_alloc_rx_page(rx_ring, rx_info,
GFP_ATOMIC | __GFP_COMP);
if (unlikely(rc < 0)) {
@@ -868,9 +864,15 @@ static struct sk_buff *ena_rx_skb(struct
struct ena_rx_buffer *rx_info;
u16 len, req_id, buf = 0;
void *va;
+ int rc;
len = ena_bufs[buf].len;
req_id = ena_bufs[buf].req_id;
+
+ rc = validate_rx_req_id(rx_ring, req_id);
+ if (unlikely(rc < 0))
+ return NULL;
+
rx_info = &rx_ring->rx_buffer_info[req_id];
if (unlikely(!rx_info->page)) {
@@ -943,6 +945,11 @@ static struct sk_buff *ena_rx_skb(struct
buf++;
len = ena_bufs[buf].len;
req_id = ena_bufs[buf].req_id;
+
+ rc = validate_rx_req_id(rx_ring, req_id);
+ if (unlikely(rc < 0))
+ return NULL;
+
rx_info = &rx_ring->rx_buffer_info[req_id];
} while (1);
