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| author | Eelco Chaudron <echaudro@redhat.com> | 2020-11-03 09:25:49 +0100 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2020-11-03 16:57:42 -0800 |
| commit | fea07a487c6dd422dc8837237c9d2bc7c33119af (patch) | |
| tree | ebc98ebedce3b675e448eea3944ed2215c164c3c | |
| parent | dbfe394dad33f99cf8458be50483ec40a5d29c34 (diff) | |
| download | lwn-fea07a487c6dd422dc8837237c9d2bc7c33119af.tar.gz lwn-fea07a487c6dd422dc8837237c9d2bc7c33119af.zip | |
net: openvswitch: silence suspicious RCU usage warning
Silence suspicious RCU usage warning in ovs_flow_tbl_masks_cache_resize()
by replacing rcu_dereference() with rcu_dereference_ovsl().
In addition, when creating a new datapath, make sure it's configured under
the ovs_lock.
Fixes: 9bf24f594c6a ("net: openvswitch: make masks cache size configurable")
Reported-by: syzbot+9a8f8bfcc56e8578016c@syzkaller.appspotmail.com
Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Link: https://lore.kernel.org/r/160439190002.56943.1418882726496275961.stgit@ebuild
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | net/openvswitch/datapath.c | 14 | ||||
| -rw-r--r-- | net/openvswitch/flow_table.c | 2 |
2 files changed, 8 insertions, 8 deletions
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c index 832f898edb6a..9d6ef6cb9b26 100644 --- a/net/openvswitch/datapath.c +++ b/net/openvswitch/datapath.c @@ -1703,13 +1703,13 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) parms.port_no = OVSP_LOCAL; parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID]; - err = ovs_dp_change(dp, a); - if (err) - goto err_destroy_meters; - /* So far only local changes have been made, now need the lock. */ ovs_lock(); + err = ovs_dp_change(dp, a); + if (err) + goto err_unlock_and_destroy_meters; + vport = new_vport(&parms); if (IS_ERR(vport)) { err = PTR_ERR(vport); @@ -1725,8 +1725,7 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) ovs_dp_reset_user_features(skb, info); } - ovs_unlock(); - goto err_destroy_meters; + goto err_unlock_and_destroy_meters; } err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, @@ -1741,7 +1740,8 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) ovs_notify(&dp_datapath_genl_family, reply, info); return 0; -err_destroy_meters: +err_unlock_and_destroy_meters: + ovs_unlock(); ovs_meters_exit(dp); err_destroy_ports: kfree(dp->ports); diff --git a/net/openvswitch/flow_table.c b/net/openvswitch/flow_table.c index f3486a37361a..c89c8da99f1a 100644 --- a/net/openvswitch/flow_table.c +++ b/net/openvswitch/flow_table.c @@ -390,7 +390,7 @@ static struct mask_cache *tbl_mask_cache_alloc(u32 size) } int ovs_flow_tbl_masks_cache_resize(struct flow_table *table, u32 size) { - struct mask_cache *mc = rcu_dereference(table->mask_cache); + struct mask_cache *mc = rcu_dereference_ovsl(table->mask_cache); struct mask_cache *new; if (size == mc->cache_size) |