netdev - [net-next 02/15] net/mlx5: fs, assert null dest pointer when dest

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Date:   Sat,  3 Dec 2022 14:13:24 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...dia.com>, Oz Shlomo <ozsh@...dia.com>,
        Roi Dayan <roid@...dia.com>, Mark Bloch <mbloch@...dia.com>
Subject: [net-next 02/15] net/mlx5: fs, assert null dest pointer when dest_num is 0

From: Oz Shlomo <ozsh@...dia.com>

Currently create_flow_handle() assumes a null dest pointer when there
are no destinations.
This might not be the case as the caller may pass an allocated dest
array while setting the dest_num parameter to 0.

Assert null dest array for flow rules that have no destinations (e.g. drop
rule).

Signed-off-by: Oz Shlomo <ozsh@...dia.com>
Reviewed-by: Roi Dayan <roid@...dia.com>
Reviewed-by: Mark Bloch <mbloch@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/fs_core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
index d53749248fa0..d53190f22871 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
@@ -1962,6 +1962,9 @@ _mlx5_add_flow_rules(struct mlx5_flow_table *ft,
 	if (flow_act->fg && ft->autogroup.active)
 		return ERR_PTR(-EINVAL);
 
+	if (dest && dest_num <= 0)
+		return ERR_PTR(-EINVAL);
+
 	for (i = 0; i < dest_num; i++) {
 		if (!dest_is_valid(&dest[i], flow_act, ft))
 			return ERR_PTR(-EINVAL);
-- 
2.38.1