From: Emeel Hakim ehakim@nvidia.com
[ Upstream commit f3b4a00f0f62da252c598310698dfc82ef2f2e2e ]
Currently macsec offload selection update routine accesses the net device prior to holding the relevant lock. Fix by holding the lock prior to the device access.
Fixes: dcb780fb2795 ("net: macsec: add nla support for changing the offloading selection") Reviewed-by: Raed Salem raeds@nvidia.com Signed-off-by: Emeel Hakim ehakim@nvidia.com Link: https://lore.kernel.org/r/20221211075532.28099-1-ehakim@nvidia.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/macsec.c | 34 +++++++++++++++++++++------------- 1 file changed, 21 insertions(+), 13 deletions(-)
diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c index 8dafc814282c..022b2daabd74 100644 --- a/drivers/net/macsec.c +++ b/drivers/net/macsec.c @@ -2621,7 +2621,7 @@ static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info) const struct macsec_ops *ops; struct macsec_context ctx; struct macsec_dev *macsec; - int ret; + int ret = 0;
if (!attrs[MACSEC_ATTR_IFINDEX]) return -EINVAL; @@ -2634,28 +2634,36 @@ static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info) macsec_genl_offload_policy, NULL)) return -EINVAL;
+ rtnl_lock(); + dev = get_dev_from_nl(genl_info_net(info), attrs); - if (IS_ERR(dev)) - return PTR_ERR(dev); + if (IS_ERR(dev)) { + ret = PTR_ERR(dev); + goto out; + } macsec = macsec_priv(dev);
- if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) - return -EINVAL; + if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) { + ret = -EINVAL; + goto out; + }
offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]); if (macsec->offload == offload) - return 0; + goto out;
/* Check if the offloading mode is supported by the underlying layers */ if (offload != MACSEC_OFFLOAD_OFF && - !macsec_check_offload(offload, macsec)) - return -EOPNOTSUPP; + !macsec_check_offload(offload, macsec)) { + ret = -EOPNOTSUPP; + goto out; + }
/* Check if the net device is busy. */ - if (netif_running(dev)) - return -EBUSY; - - rtnl_lock(); + if (netif_running(dev)) { + ret = -EBUSY; + goto out; + }
prev_offload = macsec->offload; macsec->offload = offload; @@ -2690,7 +2698,7 @@ static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
rollback: macsec->offload = prev_offload; - +out: rtnl_unlock(); return ret; }