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Date:   Mon, 14 Aug 2023 16:12:28 +0200
From:   Florian Westphal <fw@strlen.de>
To:     Dong Chenchen <dongchenchen2@huawei.com>
Cc:     steffen.klassert@secunet.com, herbert@gondor.apana.org.au,
        davem@davemloft.net, fw@strlen.de, leon@kernel.org,
        edumazet@google.com, kuba@kernel.org, pabeni@redhat.com,
        timo.teras@iki.fi, yuehaibing@huawei.com, weiyongjun1@huawei.com,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [Patch net, v2] net: xfrm: skip policies marked as dead while
 reinserting policies
Message-ID: <20230814141228.GC25551@breakpoint.cc>
References: <20230814140013.712001-1-dongchenchen2@huawei.com>
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Dong Chenchen <dongchenchen2@huawei.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@strlen.de>