On Tue, Oct 10, 2017 at 05:01:16PM +0000, Colin King wrote:
> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>
> Currently rt6_ex is being dereferenced before it is null checked
> hence there is a possible null dereference bug. Fix this by only
> dereferencing rt6_ex after it has been null checked.
>
> Detected by CoverityScan, CID#1457749 ("Dereference before null check")
>
> Fixes: 81eb8447daae ("ipv6: take care of rt6_stats")
> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Acked-by: Martin KaFai Lau <kafai@xxxxxx>
> ---
> net/ipv6/route.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> index 606e80325b21..6db1541eaa7b 100644
> --- a/net/ipv6/route.c
> +++ b/net/ipv6/route.c
> @@ -1152,10 +1152,12 @@ static DEFINE_SPINLOCK(rt6_exception_lock);
> static void rt6_remove_exception(struct rt6_exception_bucket *bucket,
> struct rt6_exception *rt6_ex)
> {
> - struct net *net = dev_net(rt6_ex->rt6i->dst.dev);
> + struct net *net;
>
> if (!bucket || !rt6_ex)
> return;
> +
> + net = dev_net(rt6_ex->rt6i->dst.dev);
> rt6_ex->rt6i->rt6i_node = NULL;
> hlist_del_rcu(&rt6_ex->hlist);
> rt6_release(rt6_ex->rt6i);
> --
> 2.14.1
>
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