[PATCH 1/2 net] net: mvpp2: prevent buffer overflow in mvpp22_rss_ctx()

[Dan Carpenter]

The "rss_context" variable comes from the user via  ethtool_get_rxfh().
It can be any u32 value except zero.  Eventually it gets passed to
mvpp22_rss_ctx() and if it is over MVPP22_N_RSS_TABLES (8) then it
results in an array overflow.

Fixes: 895586d5dc32 ("net: mvpp2: cls: Use RSS contexts to handle RSS tables")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c 
b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 1fa60e985b43a..2b5dad2ec650c 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -4329,6 +4329,8 @@ static int mvpp2_ethtool_get_rxfh_context(struct 
net_device *dev, u32 *indir,
 
        if (!mvpp22_rss_is_supported())
                return -EOPNOTSUPP;
+       if (rss_context >= MVPP22_N_RSS_TABLES)
+               return -EINVAL;
 
        if (hfunc)
                *hfunc = ETH_RSS_HASH_CRC32;
-- 
2.26.2