netdev - Re: [PATCH net-next] net/sched: Fix kernel NULL pointer dereference

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Date:   Thu, 11 Jul 2019 01:13:33 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     wenxu@...oud.cn
Cc:     davem@...emloft.net, netfilter-devel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net/sched: Fix kernel NULL pointer dereference

On Thu, Jul 11, 2019 at 12:03:37AM +0200, Pablo Neira Ayuso wrote:
> On Wed, Jul 10, 2019 at 09:45:04PM +0800, wenxu@...oud.cn wrote:
> > From: wenxu <wenxu@...oud.cn>
> > 
> > [  697.665184] BUG: kernel NULL pointer dereference, address: 0000000000000030
> > [  697.665550] #PF: supervisor read access in kernel mode
> > [  697.665906] #PF: error_code(0x0000) - not-present page
> > [  697.666297] PGD 800000104e636067 P4D 800000104e636067 PUD ff4b02067 PMD 0
> > [  697.666710] Oops: 0000 [#1] SMP PTI
> > [  697.667115] CPU: 31 PID: 24466 Comm: modprobe Kdump: loaded Tainted: G           O      5.2.0-rc6+ #1
> > [  697.667867] Hardware name: Huawei Technologies Co., Ltd. RH1288 V3/BC11HGSC0, BIOS 3.57 02/26/2017
> > [  697.668620] RIP: 0010:tc_indr_block_ing_cmd.isra.52+0x4c/0xb0
> > [  697.669029] Code: 83 ec 40 65 48 8b 04 25 28 00 00 00 48 89 45 e8 31 c0 f3 48 ab 48 8b 06 49 8b b3 e8 04 00 00 44 89 45 b0 c7 45 b4 01 00 00 00 <8b> 48 30 48 89 75 c0 85 c9 48 8d 4d b0 0f 95 45 b8 48 85 c0 4c 8d
> > [  697.670132] RSP: 0018:ffffc90007bf7958 EFLAGS: 00010246
> > [  697.670537] RAX: 0000000000000000 RBX: ffff88905e2cbae8 RCX: 0000000000000000
> > [  697.670938] RDX: ffff88905e2cbcd8 RSI: ffffffff823a8480 RDI: ffffc90007bf7990
> > [  697.671352] RBP: ffffc90007bf79a8 R08: 0000000000000000 R09: ffff88905e2cbcc0
> > [  697.671761] R10: ffff888107c07780 R11: ffff88902c249000 R12: ffff88905e2cbcd0
> > [  697.672173] R13: ffff88905e2cbac0 R14: ffff88885596bc00 R15: ffff88905e2cbcc0
> > [  697.672582] FS:  00007fe0b4095740(0000) GS:ffff88905fbc0000(0000) knlGS:0000000000000000
> > [  697.673335] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [  697.673746] CR2: 0000000000000030 CR3: 0000000ff46b4005 CR4: 00000000001606e0
> > [  697.674156] Call Trace:
> > [  697.674563]  __tc_indr_block_cb_register+0x11e/0x3c0
> > [  697.674998]  mlx5e_nic_rep_netdevice_event+0x9e/0x110 [mlx5_core]
> > [  697.675411]  notifier_call_chain+0x53/0xa0
> > [  697.675812]  raw_notifier_call_chain+0x16/0x20
> > [  697.676223]  call_netdevice_notifiers_info+0x2d/0x60
> > [  697.676633]  register_netdevice+0x3fa/0x500
> > 
> > get indr_dev->block after check it.
> > 
> > Fixes: 955bcb6ea0df ("drivers: net: use flow block API")
> > Signed-off-by: wenxu <wenxu@...oud.cn>
> 
> Acked-by: Pablo Neira Ayuso <pablo@...filter.org>

Please, toss this patch.

Vlad's patch provides a more complete fix.