linux-kernel - Re: [Patch net, v2] net: xfrm: skip policies marked as dead while reinserting policies

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Message-ID: <20230814141228.GC25551@breakpoint.cc>
Date:   Mon, 14 Aug 2023 16:12:28 +0200
From:   Florian Westphal <fw@...len.de>
To:     Dong Chenchen <dongchenchen2@...wei.com>
Cc:     steffen.klassert@...unet.com, herbert@...dor.apana.org.au,
        davem@...emloft.net, fw@...len.de, leon@...nel.org,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        timo.teras@....fi, yuehaibing@...wei.com, weiyongjun1@...wei.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Patch net, v2] net: xfrm: skip policies marked as dead while
 reinserting policies

Dong Chenchen <dongchenchen2@...wei.com> wrote:
> BUG: KASAN: slab-use-after-free in xfrm_policy_inexact_list_reinsert+0xb6/0x430
> Read of size 1 at addr ffff8881051f3bf8 by task ip/668
> 
> CPU: 2 PID: 668 Comm: ip Not tainted 6.5.0-rc5-00182-g25aa0bebba72-dirty #64
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13 04/01/2014
> Call Trace:
>  <TASK>
>  dump_stack_lvl+0x72/0xa0
>  print_report+0xd0/0x620
>  kasan_report+0xb6/0xf0
>  xfrm_policy_inexact_list_reinsert+0xb6/0x430
>  xfrm_policy_inexact_insert_node.constprop.0+0x537/0x800
>  xfrm_policy_inexact_alloc_chain+0x23f/0x320
>  xfrm_policy_inexact_insert+0x6b/0x590
>  xfrm_policy_insert+0x3b1/0x480
>  xfrm_add_policy+0x23c/0x3c0
>  xfrm_user_rcv_msg+0x2d0/0x510
>  netlink_rcv_skb+0x10d/0x2d0
>  xfrm_netlink_rcv+0x49/0x60
>  netlink_unicast+0x3fe/0x540
>  netlink_sendmsg+0x528/0x970
>  sock_sendmsg+0x14a/0x160
>  ____sys_sendmsg+0x4fc/0x580
>  ___sys_sendmsg+0xef/0x160
>  __sys_sendmsg+0xf7/0x1b0
>  do_syscall_64+0x3f/0x90
>  entry_SYSCALL_64_after_hwframe+0x73/0xdd

Thanks for following up.

Acked-by: Florian Westphal <fw@...len.de>