netdev - Re: [PATCH net] act_connmark: avoid crashing on malformed nlattrs with null parms

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Message-ID: <CAM_iQpVEXaYm=KGs1fh8tCukHotwynVykr=pxR5bu2s27ug=vg@mail.gmail.com>
Date:   Fri, 10 Mar 2017 09:33:38 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Etienne Noss <etienne.noss@...irst.fr>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Victorien Molle <victorien.molle@...irst.fr>
Subject: Re: [PATCH net] act_connmark: avoid crashing on malformed nlattrs
 with null parms

On Fri, Mar 10, 2017 at 7:55 AM, Etienne Noss <etienne.noss@...irst.fr> wrote:
> tcf_connmark_init does not check in its configuration if TCA_CONNMARK_PARMS
> is set, resulting in a null pointer dereference when trying to access it.
>
> [501099.043007] BUG: unable to handle kernel NULL pointer dereference at 0000000000000004
> [501099.043039] IP: [<ffffffffc10c60fb>] tcf_connmark_init+0x8b/0x180 [act_connmark]
> ...
> [501099.044334] Call Trace:
> [501099.044345]  [<ffffffffa47270e8>] ? tcf_action_init_1+0x198/0x1b0
> [501099.044363]  [<ffffffffa47271b0>] ? tcf_action_init+0xb0/0x120
> [501099.044380]  [<ffffffffa47250a4>] ? tcf_exts_validate+0xc4/0x110
> [501099.044398]  [<ffffffffc0f5fa97>] ? u32_set_parms+0xa7/0x270 [cls_u32]
> [501099.044417]  [<ffffffffc0f60bf0>] ? u32_change+0x680/0x87b [cls_u32]
> [501099.044436]  [<ffffffffa4725d1d>] ? tc_ctl_tfilter+0x4dd/0x8a0
> [501099.044454]  [<ffffffffa44a23a1>] ? security_capable+0x41/0x60
> [501099.044471]  [<ffffffffa470ca01>] ? rtnetlink_rcv_msg+0xe1/0x220
> [501099.044490]  [<ffffffffa470c920>] ? rtnl_newlink+0x870/0x870
> [501099.044507]  [<ffffffffa472cc61>] ? netlink_rcv_skb+0xa1/0xc0
> [501099.044524]  [<ffffffffa47073f4>] ? rtnetlink_rcv+0x24/0x30
> [501099.044541]  [<ffffffffa472c634>] ? netlink_unicast+0x184/0x230
> [501099.044558]  [<ffffffffa472c9d8>] ? netlink_sendmsg+0x2f8/0x3b0
> [501099.044576]  [<ffffffffa46d8880>] ? sock_sendmsg+0x30/0x40
> [501099.044592]  [<ffffffffa46d8e03>] ? SYSC_sendto+0xd3/0x150
> [501099.044608]  [<ffffffffa425fda1>] ? __do_page_fault+0x2d1/0x510
> [501099.044626]  [<ffffffffa47fbd7b>] ? system_call_fast_compare_end+0xc/0x9b
>
> Signed-off-by: Étienne Noss <etienne.noss@...irst.fr>
> Signed-off-by: Victorien Molle <victorien.molle@...irst.fr>

Fixes:  22a5dc0e5e3e ("net: sched: Introduce connmark action")
Acked-by: Cong Wang <xiyou.wangcong@...il.com>


> ---
>  net/sched/act_connmark.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/net/sched/act_connmark.c b/net/sched/act_connmark.c
> index ab8062909962..f9bb43c25697 100644
> --- a/net/sched/act_connmark.c
> +++ b/net/sched/act_connmark.c
> @@ -113,6 +113,9 @@ static int tcf_connmark_init(struct net *net, struct nlattr *nla,
>         if (ret < 0)
>                 return ret;
>
> +       if (!tb[TCA_CONNMARK_PARMS])
> +               return -EINVAL;
> +
>         parm = nla_data(tb[TCA_CONNMARK_PARMS]);
>
>         if (!tcf_hash_check(tn, parm->index, a, bind)) {
> --
> 2.11.0
>