linux-kernel - Re: next-20180605 - BUG in ipv6_add

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Date:   Fri, 8 Jun 2018 19:54:30 -0700
From:   Dexuan-Linux Cui <dexuan.linux@...il.com>
To:     David Ahern <dsahern@...il.com>
Cc:     valdis.kletnieks@...edu, netdev@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Dexuan Cui <decui@...rosoft.com>
Subject: Re: next-20180605 - BUG in ipv6_add_addr

On Thu, Jun 7, 2018 at 5:51 PM, David Ahern <dsahern@...il.com> wrote:
>
> ...
> I know you don't have a reliable reproducer, but I did find one spot
> where I was too clever and did not initialize a new cfg variable:
>
> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> index 89019bf59f46..59c22a25e654 100644
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -1324,6 +1324,7 @@ static int ipv6_create_tempaddr(struct
> inet6_ifaddr *ifp,
>                 }
>         }
>
> +       memset(&cfg, 0, sizeof(cfg));
>         cfg.valid_lft = min_t(__u32, ifp->valid_lft,
>                               idev->cnf.temp_valid_lft + age);
>         cfg.preferred_lft = cnf_temp_preferred_lft + age -
> idev->desync_factor;

This works for me. Great!

Thanks,
-- Dexuan