netdev - Re: [PATCH] net/bridge: Add missing in6_dev_put in br_validate

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Message-ID: <20150703204213.GM16529@breakpoint.cc>
Date:	Fri, 3 Jul 2015 22:42:13 +0200
From:	Florian Westphal <fw@...len.de>
To:	Julien Grall <julien.grall@...rix.com>
Cc:	stephen@...workplumber.org, davem@...emloft.net,
	bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
	Bernhard Thaler <bernhard.thaler@...et.at>,
	Pablo Neira Ayuso <pablo@...filter.org>, fw@...len.de,
	ian.campbell@...rix.com, wei.liu2@...rix.com
Subject: Re: [PATCH] net/bridge: Add missing in6_dev_put in br_validate_ipv6

Julien Grall <julien.grall@...rix.com> wrote:
> The commit efb6de9b4ba0092b2c55f6a52d16294a8a698edd "netfilter: bridge:
> forward IPv6 fragmented packets" introduced a new function
> br_validate_ipv6 which take a reference on the inet6 device. Although,
> the reference is not released at the end.
> 
> This will result to the impossibility to destroy any netdevice using
> ipv6 and bridge.
> 
> Spotted while trying to destroy a Xen guest on the upstream Linux:
> "unregister_netdevice: waiting for vif1.0 to become free. Usage count = 1"

Ugh :-/

I think it makes more sense to use __in6_dev_get() instead which doesn't
take a reference.
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