netdev - Re: [PATCH] xfrm: fix potential incorrect pointer dereference in xfrm_bundle

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Date:	Sat, 25 Jan 2014 11:07:45 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	horia.geanta@...escale.com
Cc:	steffen.klassert@...unet.com, netdev@...r.kernel.org
Subject: Re: [PATCH] xfrm: fix potential incorrect pointer dereference in
 xfrm_bundle_create

From: Horia Geanta <horia.geanta@...escale.com>
Date: Sat, 25 Jan 2014 20:47:53 +0200

> Return value of xfrm_alloc_dst might be an error code.
> Need to check this before using the pointer safely.
> 
> Signed-off-by: Horia Geanta <horia.geanta@...escale.com>
> ---
>  net/xfrm/xfrm_policy.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
> index 9a91f74..f230f2a 100644
> --- a/net/xfrm/xfrm_policy.c
> +++ b/net/xfrm/xfrm_policy.c
> @@ -1541,7 +1541,7 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
>  
>  	for (; i < nx; i++) {
>  		struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
> -		struct dst_entry *dst1 = &xdst->u.dst;
> +		struct dst_entry *dst1;

There is no harm in taking the address of a bad pointer.  The only
trouble is if we actually dereference it, which we are not doing here.

I'm not applying this patch, sorry.
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