The "fsp->location" variable comes from user via ethtool_get_rxnfc().
Check that it is valid to prevent an out of bounds read.
Fixes: 7aab747e5563 ("net: ethernet: mediatek: add ethtool functions to configure RX flows of HW LRO")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
drivers/net/ethernet/mediatek/mtk_eth_soc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index a9d4fd8945bb..b3b3c079a0fa 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -2212,6 +2212,9 @@ static int mtk_hwlro_get_fdir_entry(struct net_device *dev,
struct ethtool_rx_flow_spec *fsp =
(struct ethtool_rx_flow_spec *)&cmd->fs;
+ if (fsp->location >= ARRAY_SIZE(mac->hwlro_ip))
+ return -EINVAL;
+
/* only tcp dst ipv4 is meaningful, others are meaningless */
fsp->flow_type = TCP_V4_FLOW;
fsp->h_u.tcp_ip4_spec.ip4dst = ntohl(mac->hwlro_ip[fsp->location]);
--
2.35.1
