target/linux/generic/backport-5.15/702-v5.19-32-net-ethernet-mtk_eth_soc-out-of-bounds-read-in-mtk_h.patch

   1 From: Dan Carpenter <dan.carpenter@oracle.com>
   2 Date: Thu, 26 May 2022 11:02:42 +0300
   3 Subject: [PATCH] net: ethernet: mtk_eth_soc: out of bounds read in
   4  mtk_hwlro_get_fdir_entry()
   5
   6 The "fsp->location" variable comes from user via ethtool_get_rxnfc().
   7 Check that it is valid to prevent an out of bounds read.
   8
   9 Fixes: 7aab747e5563 ("net: ethernet: mediatek: add ethtool functions to configure RX flows of HW LRO")
  10 Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
  11 Signed-off-by: David S. Miller <davem@davemloft.net>
  12 ---
  13
  14 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  15 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  16 @@ -2230,6 +2230,9 @@ static int mtk_hwlro_get_fdir_entry(stru
  17         struct ethtool_rx_flow_spec *fsp =
  18                 (struct ethtool_rx_flow_spec *)&cmd->fs;
  19
  20 +       if (fsp->location >= ARRAY_SIZE(mac->hwlro_ip))
  21 +               return -EINVAL;
  22 +
  23         /* only tcp dst ipv4 is meaningful, others are meaningless */
  24         fsp->flow_type = TCP_V4_FLOW;
  25         fsp->h_u.tcp_ip4_spec.ip4dst = ntohl(mac->hwlro_ip[fsp->location]);