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net: ethernet: mvpp2_main: fix possible OOB write in mvpp2_ethtool_get_rxnfc()

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rules is allocated in ethtool_get_rxnfc and the size is determined by
rule_cnt from user space. So rule_cnt needs to be check before using
rules to avoid OOB writing or NULL pointer dereference.

Fixes: 90b509b39ac9 ("net: mvpp2: cls: Add Classification offload support")
Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
Reviewed-by: Marcin Wojtas <mw@semihalf.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hangyu Hua 2023-09-08 14:19:49 +08:00 committed by David S. Miller
parent 9b90aca97f
commit 51fe0a4705
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
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@ -5586,6 +5586,11 @@ static int mvpp2_ethtool_get_rxnfc(struct net_device *dev,
break;
case ETHTOOL_GRXCLSRLALL:
for (i = 0; i < MVPP2_N_RFS_ENTRIES_PER_FLOW; i++) {
if (loc == info->rule_cnt) {
ret = -EMSGSIZE;
break;
}
if (port->rfs_rules[i])
rules[loc++] = i;
}