linux-kernel - Re: [syzbot] [net?] KASAN: slab-use-after-free Write in __xfrm_state

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Message-ID: <68ae7567.a70a0220.3cafd4.0006.GAE@google.com>
Date: Tue, 26 Aug 2025 20:03:03 -0700
From: syzbot <syzbot+a25ee9d20d31e483ba7b@...kaller.appspotmail.com>
To: eadavis@...com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] KASAN: slab-use-after-free Write in __xfrm_state_delete

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in xfrm_state_fini

------------[ cut here ]------------
WARNING: CPU: 1 PID: 3658 at net/xfrm/xfrm_state.c:3301 xfrm_state_fini+0x26d/0x2f0 net/xfrm/xfrm_state.c:3301
Modules linked in:
CPU: 1 UID: 0 PID: 3658 Comm: kworker/u8:14 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: netns cleanup_net
RIP: 0010:xfrm_state_fini+0x26d/0x2f0 net/xfrm/xfrm_state.c:3301
Code: c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 6b b2 00 f8 48 8b 3b 5b 41 5c 41 5d 41 5e 41 5f 5d e9 29 73 e1 f7 e8 84 46 9d f7 90 <0f> 0b 90 e9 fd fd ff ff e8 76 46 9d f7 90 0f 0b 90 e9 60 fe ff ff
RSP: 0018:ffffc9000c5c7898 EFLAGS: 00010293
RAX: ffffffff8a2264ac RBX: ffff888033aa8000 RCX: ffff888030f70000
RDX: 0000000000000000 RSI: ffffffff8be33660 RDI: ffffffff84d05cc3
RBP: ffffc9000c5c79b0 R08: ffffffff8fa38437 R09: 1ffffffff1f47086
R10: dffffc0000000000 R11: fffffbfff1f47087 R12: ffffffff8f631480
R13: 1ffff920018b8f40 R14: ffff888033aa9480 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125d1a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f67e456d480 CR3: 0000000079c90000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 xfrm_net_exit+0x2d/0x70 net/xfrm/xfrm_policy.c:4354
 ops_exit_list net/core/net_namespace.c:198 [inline]
 ops_undo_list+0x49a/0x990 net/core/net_namespace.c:251
 cleanup_net+0x4c5/0x800 net/core/net_namespace.c:682
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


Tested on:

commit:         24204116 Merge branch 'ipv6-sr-simplify-and-optimize-h..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15d69ef0580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=67b99ceb67d33475
dashboard link: https://syzkaller.appspot.com/bug?extid=a25ee9d20d31e483ba7b
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
patch:          https://syzkaller.appspot.com/x/patch.diff?x=142d77bc580000