netdev - Re: [PATCH] xfrm: fix crash in XFRM_MSG

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Date:	Tue, 05 Jul 2016 12:13:03 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	vegard.nossum@...cle.com
Cc:	steffen.klassert@...unet.com, herbert@...dor.apana.org.au,
	nicolas.dichtel@...nd.com, netdev@...r.kernel.org
Subject: Re: [PATCH] xfrm: fix crash in XFRM_MSG_GETSA netlink handler

From: Vegard Nossum <vegard.nossum@...cle.com>
Date: Tue,  5 Jul 2016 10:18:08 +0200

> If we hit any of the error conditions inside xfrm_dump_sa(), then
> xfrm_state_walk_init() never gets called. However, we still call
> xfrm_state_walk_done() from xfrm_dump_sa_done(), which will crash
> because the state walk was never initialized properly.
> 
> We can fix this by setting cb->args[0] only after we've processed the
> first element and checking this before calling xfrm_state_walk_done().
> 
> Fixes: d3623099d3 ("ipsec: add support of limited SA dump")
> Cc: Nicolas Dichtel <nicolas.dichtel@...nd.com>
> Cc: Steffen Klassert <steffen.klassert@...unet.com>
> Signed-off-by: Vegard Nossum <vegard.nossum@...cle.com>

I assume Steffen will pick this up.