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BUG: KASAN: slab-use-after-free in __xfrm_state_delete+0x666/0xca0
Write of size 8 at addr ffff88811a265710 by task syz.2.6735/31719

CPU: 0 UID: 0 PID: 31719 Comm: syz.2.6735 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <IRQ>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 __xfrm_state_delete+0x666/0xca0
 xfrm_timer_handler+0x18f/0xa00
 __hrtimer_run_queues+0x52c/0xc60
 hrtimer_run_softirq+0x187/0x2b0
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:unwind_next_frame+0x132b/0x2390
Code: b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 27 49 63 07 4c 01 f8 49 8d 4f 04 4c 39 e0 48 0f 46 e9 49 8d 47 fc 48 0f 47 d8 <4d> 0f 46 ef 48 39 dd 76 a2 e9 7b ef ff ff 44 89 f9 80 e1 07 80 c1
RSP: 0018:ffffc9000afb62b8 EFLAGS: 00000202
RAX: ffffffff8fbfa6f4 RBX: ffffffff8fbfa6f4 RCX: ffffffff8fbfa6fc
RDX: ffffffff8fbfa6f4 RSI: ffffffff903fc128 RDI: ffffffff8be337a0
RBP: ffffffff8fbfa6f4 R08: 0000000000000009 R09: ffffffff8172c195
R10: ffffc9000afb63d8 R11: ffffffff81ac3820 R12: ffffffff82183d80
R13: ffffffff8fbfa6f4 R14: ffffc9000afb6388 R15: ffffffff8fbfa6f8
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_node_track_caller_noprof+0x271/0x4e0
 kmalloc_reserve+0x136/0x290
 pskb_expand_head+0x18e/0x1150
 netlink_trim+0x1d5/0x2e0
 netlink_broadcast_filtered+0xd6/0x12c0
 nlmsg_notify+0xf0/0x1a0
 __dev_notify_flags+0xf4/0x2e0
 netif_change_flags+0xe8/0x1a0
 do_setlink+0xc55/0x41c0
 rtnl_newlink+0x149f/0x1c70
 rtnetlink_rcv_msg+0x7cf/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f508638ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f508721b038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f50865c6090 RCX: 00007f508638ebe9
RDX: 0000000000000000 RSI: 0000200000000280 RDI: 000000000000000b
RBP: 00007f5086411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f50865c6128 R14: 00007f50865c6090 R15: 00007ffcc5fb2268
 </TASK>

Allocated by task 31604:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x230/0x3d0
 fanout_add+0x222/0x12a0
 packet_setsockopt+0xafe/0x12c0
 do_sock_setsockopt+0x17c/0x1b0
 __x64_sys_setsockopt+0x13f/0x1b0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 31602:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kfree+0x18e/0x440
 packet_release+0xa2a/0xce0
 sock_close+0xc3/0x240
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88811a265700
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 16 bytes inside of
 freed 128-byte region [ffff88811a265700, ffff88811a265780)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11a265
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000000 ffff88801a441a00 ffffea0004c2bd40 dead000000000004
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 9359, tgid 9355 (syz.2.876), ts 127809911941, free_ts 123581771361
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x370
 ___slab_alloc+0xbeb/0x1410
 __kmalloc_cache_noprof+0x296/0x3d0
 __hw_addr_add_ex+0x1f4/0x770
 dev_mc_add+0xa1/0x120
 igmp_group_added+0x1c1/0x8f0
 ____ip_mc_inc_group+0x993/0xde0
 ip_mc_up+0x125/0x300
 inetdev_event+0xfb3/0x15b0
 notifier_call_chain+0x1b6/0x3e0
 __dev_notify_flags+0x18d/0x2e0
 netif_change_flags+0xe8/0x1a0
page last free pid 24 tgid 24 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 vfree+0x25a/0x400
 pcpu_balance_free+0x6ae/0x940
 pcpu_balance_workfn+0xd01/0xe00
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30

Memory state around the buggy address:
 ffff88811a265600: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
 ffff88811a265680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88811a265700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff88811a265780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88811a265800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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