netdev - Re: [PATCH 1/2] rtnetlink: Warn when interface's information won't fit in our packet

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Message-ID: <20140424154935.GC2864@minipsycho.orion>
Date:	Thu, 24 Apr 2014 17:49:35 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	David Gibson <david@...son.dropbear.id.au>
Cc:	netdev@...r.kernel.org, ssujith@...co.com, neepatel@...co.com,
	benve@...co.com, davem@...emloft.net, ben@...adent.org.uk,
	govindarajulu90@...il.com, gregory.v.rose@...el.com
Subject: Re: [PATCH 1/2] rtnetlink: Warn when interface's information won't
 fit in our packet

Thu, Apr 24, 2014 at 02:22:35AM CEST, david@...son.dropbear.id.au wrote:
>Without IFLA_EXT_MASK specified, the information reported for a single
>interface in response to RTM_GETLINK is expected to fit within a netlink
>packet of NLMSG_GOODSIZE.
>
>If it doesn't, however, things will go badly wrong,  When listing all
>interfaces, netlink_dump() will incorrectly treat -EMSGSIZE on the first
>message in a packet as the end of the listing and omit information for
>that interface and all subsequent ones.  This can cause getifaddrs(3) to
>enter an infinite loop.
>
>This patch won't fix the problem, but it will WARN_ON() making it easier to
>track down what's going wrong.
>
>Signed-off-by: David Gibson <david@...son.dropbear.id.au>

Reviewed-by: Jiri Pirko <jpirko@...hat.com>
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