netdev - Re: [PATCHv3 net 3/3] ipv6: sr: fix invalid unregister error path

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Date: Fri, 10 May 2024 10:32:07 +0200
From: Sabrina Dubroca <sd@...asysnail.net>
To: Hangbin Liu <liuhangbin@...il.com>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Vasiliy Kovalev <kovalev@...linux.org>,
	Guillaume Nault <gnault@...hat.com>,
	Simon Horman <horms@...nel.org>,
	David Lebrun <david.lebrun@...ouvain.be>
Subject: Re: [PATCHv3 net 3/3] ipv6: sr: fix invalid unregister error path

2024-05-09, 21:18:12 +0800, Hangbin Liu wrote:
> The error path of seg6_init() is wrong in case CONFIG_IPV6_SEG6_LWTUNNEL
> is not defined. In that case if seg6_hmac_init() fails, the
> genl_unregister_family() isn't called.
> 
> This issue exist since commit 46738b1317e1 ("ipv6: sr: add option to control
> lwtunnel support"), and commit 5559cea2d5aa ("ipv6: sr: fix possible
> use-after-free and null-ptr-deref") replaced unregister_pernet_subsys()
> with genl_unregister_family() in this error path.
> 
> Fixes: 46738b1317e1 ("ipv6: sr: add option to control lwtunnel support")
> Reported-by: Guillaume Nault <gnault@...hat.com>
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>

Reviewed-by: Sabrina Dubroca <sd@...asysnail.net>

seg6_hmac_init_algo also returns without cleaning up the previous
allocations if one fails, so it's going to leak all that memory and
the crypto tfms.

-- 
Sabrina