diff options
| author | Arthur Kiyanovski <akiyano@amazon.com> | 2020-03-17 09:06:41 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-03-17 21:24:23 -0700 |
| commit | 30623e1ed116bcd1785217d0a98eec643687e091 (patch) | |
| tree | 1114209c17300a10726665b802605100eaeb123e /drivers | |
| parent | e02ae6ed51be3d28923bfd318ae57000f5643da5 (diff) | |
| download | linux-30623e1ed116bcd1785217d0a98eec643687e091.tar.bz2 | |
net: ena: avoid memory access violation by validating req_id properly
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@amazon.com>
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/amazon/ena/ena_netdev.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c index 836fda585391..51333a05c14d 100644 --- a/drivers/net/ethernet/amazon/ena/ena_netdev.c +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c @@ -1018,13 +1018,9 @@ static int ena_refill_rx_bufs(struct ena_ring *rx_ring, u32 num) 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)) { @@ -1379,9 +1375,15 @@ static struct sk_buff *ena_rx_skb(struct ena_ring *rx_ring, 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)) { @@ -1454,6 +1456,11 @@ static struct sk_buff *ena_rx_skb(struct ena_ring *rx_ring, 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); |