netdev - Re: [PATCH] xfrm: Fix oops in __xfrm_state

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Date:   Tue, 1 Nov 2022 12:39:48 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Thomas Jarosch <thomas.jarosch@...ra2net.com>
Cc:     Steffen Klassert <steffen.klassert@...unet.com>,
        Antony Antony <antony.antony@...unet.com>,
        Sabrina Dubroca <sd@...asysnail.net>,
        Leon Romanovsky <leon@...nel.org>, Roth Mark <rothm@...l.com>,
        Zhihao Chen <chenzhihao@...zu.com>,
        Tobias Brunner <tobias@...ongswan.org>, netdev@...r.kernel.org
Subject: Re: [PATCH] xfrm: Fix oops in __xfrm_state_delete()

On Mon, Oct 31, 2022 at 04:26:12PM +0100, Thomas Jarosch wrote:
>
> diff --git a/net/key/af_key.c b/net/key/af_key.c
> index c85df5b958d2..65a9ede62d65 100644
> --- a/net/key/af_key.c
> +++ b/net/key/af_key.c
> @@ -3382,7 +3382,7 @@ static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
>  	hdr->sadb_msg_len = size / sizeof(uint64_t);
>  	hdr->sadb_msg_errno = 0;
>  	hdr->sadb_msg_reserved = 0;
> -	hdr->sadb_msg_seq = x->km.seq = get_acqseq();
> +	hdr->sadb_msg_seq = get_acqseq();

This looks broken.  x->km.seq is part of the state which you are
changing.  Shouldn't you do whatever xfrm_user does in the same
situation?

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