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net: mvpp2: prevent buffer overflow in mvpp22_rss_ctx()

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[ Upstream commit 39bd16df7c31bb8cf5dfd0c88e42abd5ae10029d ]

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.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2020-05-06 13:16:22 +03:00 committed by Greg Kroah-Hartman
parent d595dd5ba9
commit b2930c86ee
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
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@ -4319,6 +4319,8 @@ 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;