linux-kernel - [PATCH 3.16 152/202] team: avoid complex list operations in team_nl_cmd_options

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Message-ID: <lsq.1556377989.742970843@decadent.org.uk>
Date:   Sat, 27 Apr 2019 16:13:09 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Paolo Abeni" <pabeni@...hat.com>,
        syzbot+68ee510075cf64260cc4@...kaller.appspotmail.com,
        syzbot+4d4af685432dc0e56c91@...kaller.appspotmail.com,
        "Cong Wang" <xiyou.wangcong@...il.com>,
        "Jiri Pirko" <jiri@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Jiri Pirko" <jiri@...nulli.us>
Subject: [PATCH 3.16 152/202] team: avoid complex list operations in
 team_nl_cmd_options_set()

3.16.66-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Cong Wang <xiyou.wangcong@...il.com>

commit 2fdeee2549231b1f989f011bb18191f5660d3745 upstream.

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@...kaller.appspotmail.com
Reported-by: syzbot+68ee510075cf64260cc4@...kaller.appspotmail.com
Cc: Jiri Pirko <jiri@...nulli.us>
Cc: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
Acked-by: Jiri Pirko <jiri@...lanox.com>
Reviewed-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/team/team.c | 27 +++++----------------------
 1 file changed, 5 insertions(+), 22 deletions(-)

--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -253,17 +253,6 @@ static void __team_option_inst_mark_remo
 	}
 }
 
-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)
@@ -2420,7 +2409,6 @@ static int team_nl_cmd_options_set(struc
 	int err = 0;
 	int i;
 	struct nlattr *nl_option;
-	LIST_HEAD(opt_inst_list);
 
 	team = team_nl_team_get(info);
 	if (!team)
@@ -2436,6 +2424,7 @@ static int team_nl_cmd_options_set(struc
 		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;
@@ -2539,23 +2528,17 @@ static int team_nl_cmd_options_set(struc
 			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);