netdev - [PATCH net-next 09/10] mlxsw: spectrum_router: Hold a reference on RIF's netdev

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 19 Dec 2018 06:08:50 +0000
From:   Ido Schimmel <idosch@...lanox.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>,
        Petr Machata <petrm@...lanox.com>, mlxsw <mlxsw@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next 09/10] mlxsw: spectrum_router: Hold a reference on
 RIF's netdev

Previous patches tried to make RIF deletion more robust and avoid
use-after-free situations.

As another precaution, hold a reference on a RIF's netdev and release it
when the RIF is deleted.

Signed-off-by: Ido Schimmel <idosch@...lanox.com>
Reviewed-by: Petr Machata <petrm@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 08b60d4b9492..673950933dac 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -6302,6 +6302,7 @@ mlxsw_sp_rif_create(struct mlxsw_sp *mlxsw_sp,
 		err = -ENOMEM;
 		goto err_rif_alloc;
 	}
+	dev_hold(rif->dev);
 	rif->mlxsw_sp = mlxsw_sp;
 	rif->ops = ops;
 
@@ -6340,6 +6341,7 @@ mlxsw_sp_rif_create(struct mlxsw_sp *mlxsw_sp,
 	if (fid)
 		mlxsw_sp_fid_put(fid);
 err_fid_get:
+	dev_put(rif->dev);
 	kfree(rif);
 err_rif_alloc:
 err_rif_index_alloc:
@@ -6367,6 +6369,7 @@ static void mlxsw_sp_rif_destroy(struct mlxsw_sp_rif *rif)
 	if (fid)
 		/* Loopback RIFs are not associated with a FID. */
 		mlxsw_sp_fid_put(fid);
+	dev_put(rif->dev);
 	kfree(rif);
 	vr->rif_count--;
 	mlxsw_sp_vr_put(mlxsw_sp, vr);
-- 
2.20.0