linux-kernel - Re: [PATCH] bridge: multicast: add sanity check for query source addresses

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Message-Id: <20140305.204601.621108199680054921.davem@davemloft.net>
Date:	Wed, 05 Mar 2014 20:46:01 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	linus.luessing@....de
Cc:	netdev@...r.kernel.org, bridge@...ts.linux-foundation.org,
	stephen@...workplumber.org, linux-kernel@...r.kernel.org,
	jstancek@...hat.com, fwestpha@...hat.com
Subject: Re: [PATCH] bridge: multicast: add sanity check for query source
 addresses

From: Linus Lüssing <linus.luessing@....de>
Date: Tue,  4 Mar 2014 03:57:35 +0100

> MLD queries are supposed to have an IPv6 link-local source address
> according to RFC2710, section 4 and RFC3810, section 5.1.14. This patch
> adds a sanity check to ignore such broken MLD queries.
> 
> Without this check, such malformed MLD queries can result in a
> denial of service: The queries are ignored by any MLD listener
> therefore they will not respond with an MLD report. However,
> without this patch these malformed MLD queries would enable the
> snooping part in the bridge code, potentially shutting down the
> according ports towards these hosts for multicast traffic as the
> bridge did not learn about these listeners.
> 
> Reported-by: Jan Stancek <jstancek@...hat.com>
> Signed-off-by: Linus Lüssing <linus.luessing@....de>

Applied.
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