[Patch net] team: avoid complex list operations in team_nl_cmd_options_set()

[Patch net] team: avoid complex list operations in team_nl_cmd_options_set()

[Cong Wang]

The current opt_inst_list operations inside team_nl_cmd_options_set()
is too complex to track:

    LIST_HEAD(opt_inst_list);
    nla_for_each_nested(...) {
        list_for_each_entry(opt_inst, &team->option_inst_list, list) {
            if (__team_option_inst_tmp_find(&opt_inst_list, opt_inst))
                continue;
            list_add(&opt_inst->tmp_list, &opt_inst_list);
        }
    }
    team_nl_send_event_options_get(team, &opt_inst_list);

as while we retrieve 'opt_inst' from team->option_inst_list, it could
be added to the local 'opt_inst_list' for multiple times. The
__team_option_inst_tmp_find() doesn't work, as the setter
team_mode_option_set() still calls team->ops.exit() which uses
->tmp_list too in __team_options_change_check().

Simplify the list operations by moving the 'opt_inst_list' and
team_nl_send_event_options_get() into the nla_for_each_nested() loop so
that it can be guranteed that we won't insert a same list entry for
multiple times. Therefore, __team_option_inst_tmp_find() can be removed
too.

Fixes: 4fb0534fb7bb ("team: avoid adding twice the same option to the event list")
Fixes: 2fcdb2c9e659 ("team: allow to send multiple set events in one message")
Reported-by: syzbot+4d4af685432dc0e56c91@syzkaller.appspotmail.com
Reported-by: syzbot+68ee510075cf64260cc4@syzkaller.appspotmail.com
Cc: Jiri Pirko <jiri@resnulli.us>
Cc: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
---
 drivers/net/team/team.c | 27 +++++----------------------
 1 file changed, 5 insertions(+), 22 deletions(-)

diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index afd9d25d1992..958f1cf67282 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -256,17 +256,6 @@ static void __team_option_inst_mark_removed_port(struct team *team,
 	}
 }
 
-static bool __team_option_inst_tmp_find(const struct list_head *opts,
-					const struct team_option_inst *needle)
-{
-	struct team_option_inst *opt_inst;
-
-	list_for_each_entry(opt_inst, opts, tmp_list)
-		if (opt_inst == needle)
-			return true;
-	return false;
-}
-
 static int __team_options_register(struct team *team,
 				   const struct team_option *option,
 				   size_t option_count)
@@ -2460,7 +2449,6 @@ static int team_nl_cmd_options_set(struct sk_buff *skb, struct genl_info *info)
 	int err = 0;
 	int i;
 	struct nlattr *nl_option;
-	LIST_HEAD(opt_inst_list);
 
 	rtnl_lock();
 
@@ -2480,6 +2468,7 @@ static int team_nl_cmd_options_set(struct sk_buff *skb, struct genl_info *info)
 		struct nlattr *opt_attrs[TEAM_ATTR_OPTION_MAX + 1];
 		struct nlattr *attr;
 		struct nlattr *attr_data;
+		LIST_HEAD(opt_inst_list);
 		enum team_option_type opt_type;
 		int opt_port_ifindex = 0; /* != 0 for per-port options */
 		u32 opt_array_index = 0;
@@ -2584,23 +2573,17 @@ static int team_nl_cmd_options_set(struct sk_buff *skb, struct genl_info *info)
 			if (err)
 				goto team_put;
 			opt_inst->changed = true;
-
-			/* dumb/evil user-space can send us duplicate opt,
-			 * keep only the last one
-			 */
-			if (__team_option_inst_tmp_find(&opt_inst_list,
-							opt_inst))
-				continue;
-
 			list_add(&opt_inst->tmp_list, &opt_inst_list);
 		}
 		if (!opt_found) {
 			err = -ENOENT;
 			goto team_put;
 		}
-	}
 
-	err = team_nl_send_event_options_get(team, &opt_inst_list);
+		err = team_nl_send_event_options_get(team, &opt_inst_list);
+		if (err)
+			break;
+	}
 
 team_put:
 	team_nl_team_put(team);
-- 
2.20.1

Re: [Patch net] team: avoid complex list operations in team_nl_cmd_options_set()

[Jiri Pirko]

Tue, Feb 12, 2019 at 06:59:51AM CET, xiyou.wangcong@gmail.com wrote:
>The current opt_inst_list operations inside team_nl_cmd_options_set()
>is too complex to track:
>
>    LIST_HEAD(opt_inst_list);
>    nla_for_each_nested(...) {
>        list_for_each_entry(opt_inst, &team->option_inst_list, list) {
>            if (__team_option_inst_tmp_find(&opt_inst_list, opt_inst))
>                continue;
>            list_add(&opt_inst->tmp_list, &opt_inst_list);
>        }
>    }
>    team_nl_send_event_options_get(team, &opt_inst_list);
>
>as while we retrieve 'opt_inst' from team->option_inst_list, it could
>be added to the local 'opt_inst_list' for multiple times. The
>__team_option_inst_tmp_find() doesn't work, as the setter
>team_mode_option_set() still calls team->ops.exit() which uses
>->tmp_list too in __team_options_change_check().
>
>Simplify the list operations by moving the 'opt_inst_list' and
>team_nl_send_event_options_get() into the nla_for_each_nested() loop so
>that it can be guranteed that we won't insert a same list entry for
>multiple times. Therefore, __team_option_inst_tmp_find() can be removed
>too.
>
>Fixes: 4fb0534fb7bb ("team: avoid adding twice the same option to the event list")
>Fixes: 2fcdb2c9e659 ("team: allow to send multiple set events in one message")
>Reported-by: syzbot+4d4af685432dc0e56c91@syzkaller.appspotmail.com
>Reported-by: syzbot+68ee510075cf64260cc4@syzkaller.appspotmail.com
>Cc: Jiri Pirko <jiri@resnulli.us>
>Cc: Paolo Abeni <pabeni@redhat.com>
>Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>

Acked-by: Jiri Pirko <jiri@mellanox.com>

Thanks!

Re: [Patch net] team: avoid complex list operations in team_nl_cmd_options_set()

[Paolo Abeni]

On Mon, 2019-02-11 at 21:59 -0800, Cong Wang wrote:
> The current opt_inst_list operations inside team_nl_cmd_options_set()
> is too complex to track:

Indeed !

>     LIST_HEAD(opt_inst_list);
>     nla_for_each_nested(...) {
>         list_for_each_entry(opt_inst, &team->option_inst_list, list) {
>             if (__team_option_inst_tmp_find(&opt_inst_list, opt_inst))
>                 continue;
>             list_add(&opt_inst->tmp_list, &opt_inst_list);
>         }
>     }
>     team_nl_send_event_options_get(team, &opt_inst_list);
> 
> as while we retrieve 'opt_inst' from team->option_inst_list, it could
> be added to the local 'opt_inst_list' for multiple times. The
> __team_option_inst_tmp_find() doesn't work, as the setter
> team_mode_option_set() still calls team->ops.exit() which uses
> ->tmp_list too in __team_options_change_check().
> Simplify the list operations by moving the 'opt_inst_list' and
> team_nl_send_event_options_get() into the nla_for_each_nested() loop so
> that it can be guranteed that we won't insert a same list entry for
> multiple times. Therefore, __team_option_inst_tmp_find() can be removed
> too.
> 
> Fixes: 4fb0534fb7bb ("team: avoid adding twice the same option to the event list")
> Fixes: 2fcdb2c9e659 ("team: allow to send multiple set events in one message")
> Reported-by: syzbot+4d4af685432dc0e56c91@syzkaller.appspotmail.com
> Reported-by: syzbot+68ee510075cf64260cc4@syzkaller.appspotmail.com
> Cc: Jiri Pirko <jiri@resnulli.us>
> Cc: Paolo Abeni <pabeni@redhat.com>
> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>

Reviewed-by: Paolo Abeni <pabeni@redhat.com>

Thank you!

Paolo

Re: [Patch net] team: avoid complex list operations in team_nl_cmd_options_set()

[David Miller]

From: Cong Wang <xiyou.wangcong@gmail.com>
Date: Mon, 11 Feb 2019 21:59:51 -0800

> The current opt_inst_list operations inside team_nl_cmd_options_set()
> is too complex to track:
> 
>     LIST_HEAD(opt_inst_list);
>     nla_for_each_nested(...) {
>         list_for_each_entry(opt_inst, &team->option_inst_list, list) {
>             if (__team_option_inst_tmp_find(&opt_inst_list, opt_inst))
>                 continue;
>             list_add(&opt_inst->tmp_list, &opt_inst_list);
>         }
>     }
>     team_nl_send_event_options_get(team, &opt_inst_list);
> 
> as while we retrieve 'opt_inst' from team->option_inst_list, it could
> be added to the local 'opt_inst_list' for multiple times. The
> __team_option_inst_tmp_find() doesn't work, as the setter
> team_mode_option_set() still calls team->ops.exit() which uses
> ->tmp_list too in __team_options_change_check().
> 
> Simplify the list operations by moving the 'opt_inst_list' and
> team_nl_send_event_options_get() into the nla_for_each_nested() loop so
> that it can be guranteed that we won't insert a same list entry for
> multiple times. Therefore, __team_option_inst_tmp_find() can be removed
> too.
> 
> Fixes: 4fb0534fb7bb ("team: avoid adding twice the same option to the event list")
> Fixes: 2fcdb2c9e659 ("team: allow to send multiple set events in one message")
> Reported-by: syzbot+4d4af685432dc0e56c91@syzkaller.appspotmail.com
> Reported-by: syzbot+68ee510075cf64260cc4@syzkaller.appspotmail.com
> Cc: Jiri Pirko <jiri@resnulli.us>
> Cc: Paolo Abeni <pabeni@redhat.com>
> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>

Applied and queued up for -stable, thanks Cong.