linux-kernel - Re: [PATCH net-next 1/3] genetlink: do not validate dump requests if there is no policy

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Message-ID: <031933f3fc4b26e284912771b480c87483574bea.camel@sipsolutions.net>
Date:   Thu, 02 May 2019 14:51:33 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Michal Kubecek <mkubecek@...e.cz>,
        "David S. Miller" <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        David Ahern <dsahern@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 1/3] genetlink: do not validate dump requests
 if there is no policy

On Thu, 2019-05-02 at 12:48 +0000, Michal Kubecek wrote:
> Unlike do requests, dump genetlink requests now perform strict validation
> by default even if the genetlink family does not set policy and maxtype
> because it does validation and parsing on its own (e.g. because it wants to
> allow different message format for different commands). While the null
> policy will be ignored, maxtype (which would be zero) is still checked so
> that any attribute will fail validation.
> 
> The solution is to only call __nla_validate() from genl_family_rcv_msg()
> if family->maxtype is set.

D'oh. Which family was it that you found this on? I checked only ones
with policy I guess.

Reviewed-by: Johannes Berg <johannes@...solutions.net>

johannes