linux-kernel - Re: [PATCH net-next v2] genetlink: do not parse attributes for families with zero maxattr

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Date:   Thu, 10 Oct 2019 13:26:54 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>,
        Johannes Berg <johannes@...solutions.net>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2] genetlink: do not parse attributes for
 families with zero maxattr

Thu, Oct 10, 2019 at 12:34:02PM CEST, mkubecek@...e.cz wrote:
>Commit c10e6cf85e7d ("net: genetlink: push attrbuf allocation and parsing
>to a separate function") moved attribute buffer allocation and attribute
>parsing from genl_family_rcv_msg_doit() into a separate function
>genl_family_rcv_msg_attrs_parse() which, unlike the previous code, calls
>__nlmsg_parse() even if family->maxattr is 0 (i.e. the family does its own
>parsing). The parser error is ignored and does not propagate out of
>genl_family_rcv_msg_attrs_parse() but an error message ("Unknown attribute
>type") is set in extack and if further processing generates no error or
>warning, it stays there and is interpreted as a warning by userspace.
>
>Dumpit requests are not affected as genl_family_rcv_msg_dumpit() bypasses
>the call of genl_family_rcv_msg_doit() if family->maxattr is zero. Do the
>same also in genl_family_rcv_msg_doit().
>
>Fixes: c10e6cf85e7d ("net: genetlink: push attrbuf allocation and parsing to a separate function")
>Signed-off-by: Michal Kubecek <mkubecek@...e.cz>

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

Thanks!