netdev - Re: [PATCH ipsec] xfrm: Ignore socket policies when rebuilding hash tables

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Date:	Fri, 29 Jul 2016 16:19:11 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Tobias Brunner <tobias@...ongswan.org>
Cc:	Steffen Klassert <steffen.klassert@...unet.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Christophe Gouault <christophe.gouault@...nd.com>
Subject: Re: [PATCH ipsec] xfrm: Ignore socket policies when rebuilding hash
 tables

On Fri, Jul 29, 2016 at 09:57:32AM +0200, Tobias Brunner wrote:
> Whenever thresholds are changed the hash tables are rebuilt.  This is
> done by enumerating all policies and hashing and inserting them into
> the right table according to the thresholds and direction.
> 
> Because socket policies are also contained in net->xfrm.policy_all but
> no hash tables are defined for their direction (dir + XFRM_POLICY_MAX)
> this causes a NULL or invalid pointer dereference after returning from
> policy_hash_bysel() if the rebuild is done while any socket policies
> are installed.
> 
> Since the rebuild after changing thresholds is scheduled this crash
> could even occur if the userland sets thresholds seemingly before
> installing any socket policies.
> 
> Fixes: 53c2e285f970 ("xfrm: Do not hash socket policies")
> Signed-off-by: Tobias Brunner <tobias@...ongswan.org>

Acked-by: Herbert Xu <herbert@...dor.apana.org.au>

Good catch, thanks!
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt