On 20 Dec 2022, at 22:27, Aaron Conole wrote:
> A recent commit introducing upcall packet accounting failed to properly
> release the vport object when the per-cpu stats struct couldn't be
> allocated. This can cause dangling pointers to dp objects long after
> they've been released.
>
> Cc: Eelco Chaudron <[email protected]>
> Cc: wangchuanlei <[email protected]>
> Fixes: 1933ea365aa7 ("net: openvswitch: Add support to count upcall packets")
> Reported-by: [email protected]
> Signed-off-by: Aaron Conole <[email protected]>
> ---
Thanks for finding and fixing this! The changes look good to me.
Acked-by: Eelco Chaudron <[email protected]>
> net/openvswitch/datapath.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
> index 932bcf766d63..6774baf9e212 100644
> --- a/net/openvswitch/datapath.c
> +++ b/net/openvswitch/datapath.c
> @@ -1854,7 +1854,7 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct
> genl_info *info)
> vport->upcall_stats = netdev_alloc_pcpu_stats(struct
> vport_upcall_stats_percpu);
> if (!vport->upcall_stats) {
> err = -ENOMEM;
> - goto err_destroy_portids;
> + goto err_destroy_vport;
> }
>
> err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
> @@ -1869,6 +1869,8 @@ 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_vport:
> + ovs_dp_detach_port(vport);
> err_destroy_portids:
> kfree(rcu_dereference_raw(dp->upcall_portids));
> err_unlock_and_destroy_meters:
> @@ -2316,7 +2318,7 @@ static int ovs_vport_cmd_new(struct sk_buff *skb,
> struct genl_info *info)
> vport->upcall_stats = netdev_alloc_pcpu_stats(struct
> vport_upcall_stats_percpu);
> if (!vport->upcall_stats) {
> err = -ENOMEM;
> - goto exit_unlock_free;
> + goto exit_unlock_free_vport;
> }
>
> err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
> @@ -2336,6 +2338,8 @@ static int ovs_vport_cmd_new(struct sk_buff *skb,
> struct genl_info *info)
> ovs_notify(&dp_vport_genl_family, reply, info);
> return 0;
>
> +exit_unlock_free_vport:
> + ovs_dp_detach_port(vport);
> exit_unlock_free:
> ovs_unlock();
> kfree_skb(reply);
> --
> 2.31.1
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