netdev - Re: [PATCH net] team: avoid adding twice the same option to the event list

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Message-Id: <20180413.140705.1693433489799741559.davem@davemloft.net>
Date:   Fri, 13 Apr 2018 14:07:05 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     pabeni@...hat.com
Cc:     netdev@...r.kernel.org, jiri@...nulli.us
Subject: Re: [PATCH net] team: avoid adding twice the same option to the
 event list

From: Paolo Abeni <pabeni@...hat.com>
Date: Fri, 13 Apr 2018 13:59:25 +0200

> When parsing the options provided by the user space,
> team_nl_cmd_options_set() insert them in a temporary list to send
> multiple events with a single message.
> While each option's attribute is correctly validated, the code does
> not check for duplicate entries before inserting into the event
> list.
> 
> Exploiting the above, the syzbot was able to trigger the following
> splat:
 ...
> This changeset addresses the avoiding list_add() if the current
> option is already present in the event list.
> 
> Reported-and-tested-by: syzbot+4d4af685432dc0e56c91@...kaller.appspotmail.com
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> Fixes: 2fcdb2c9e659 ("team: allow to send multiple set events in one message")

Looks good to me.

It's too bad that the tmp list entries don't get marked as they are
added, or get unlinked by the list processor.  Either scheme would
make the "already added" test a lot simpler.

Jiri, please review before I apply this.

Thanks.