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authorEelco Chaudron <echaudro@redhat.com>2020-11-03 09:25:49 +0100
committerJakub Kicinski <kuba@kernel.org>2020-11-03 16:57:42 -0800
commitfea07a487c6dd422dc8837237c9d2bc7c33119af (patch)
treeebc98ebedce3b675e448eea3944ed2215c164c3c /net
parentdbfe394dad33f99cf8458be50483ec40a5d29c34 (diff)
downloadlinux-fea07a487c6dd422dc8837237c9d2bc7c33119af.tar.bz2
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>
Diffstat (limited to 'net')
-rw-r--r--net/openvswitch/datapath.c14
-rw-r--r--net/openvswitch/flow_table.c2
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)