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net: openvswitch: release vport resources on failure

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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: wangchuanlei <wangchuanlei@inspur.com>
Fixes: 1933ea365a ("net: openvswitch: Add support to count upcall packets")
Reported-by: syzbot+8f4e2dcfcb3209ac35f9@syzkaller.appspotmail.com
Signed-off-by: Aaron Conole <aconole@redhat.com>
Acked-by: Eelco Chaudron <echaudro@redhat.com>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Link: https://lore.kernel.org/r/20221220212717.526780-1-aconole@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Aaron Conole 2022-12-20 16:27:17 -05:00 • committed by Jakub Kicinski
parent f2575c8f40
commit 95637d91fe
1 changed files with 6 additions and 2 deletions
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8
net/openvswitch/datapath.c
View file

@ -1861,7 +1861,7 @@ 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); vport->upcall_stats = netdev_alloc_pcpu_stats(struct vport_upcall_stats_percpu);
if (!vport->upcall_stats) { if (!vport->upcall_stats) {
err = -ENOMEM; err = -ENOMEM;
goto err_destroy_portids; goto err_destroy_vport;
} }
err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
@ -1876,6 +1876,8 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
ovs_notify(&dp_datapath_genl_family, reply, info); ovs_notify(&dp_datapath_genl_family, reply, info);
return 0; return 0;
err_destroy_vport:
ovs_dp_detach_port(vport);
err_destroy_portids: err_destroy_portids:
kfree(rcu_dereference_raw(dp->upcall_portids)); kfree(rcu_dereference_raw(dp->upcall_portids));
err_unlock_and_destroy_meters: err_unlock_and_destroy_meters:
@ -2323,7 +2325,7 @@ restart:
vport->upcall_stats = netdev_alloc_pcpu_stats(struct vport_upcall_stats_percpu); vport->upcall_stats = netdev_alloc_pcpu_stats(struct vport_upcall_stats_percpu);
if (!vport->upcall_stats) { if (!vport->upcall_stats) {
err = -ENOMEM; err = -ENOMEM;
goto exit_unlock_free; goto exit_unlock_free_vport;
} }
err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info), err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
@ -2343,6 +2345,8 @@ restart:
ovs_notify(&dp_vport_genl_family, reply, info); ovs_notify(&dp_vport_genl_family, reply, info);
return 0; return 0;
exit_unlock_free_vport:
ovs_dp_detach_port(vport);
exit_unlock_free: exit_unlock_free:
ovs_unlock(); ovs_unlock();
kfree_skb(reply); kfree_skb(reply);