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BUG: KASAN: slab-use-after-free in xfrm_state_find+0x2cf2/0x5400
Read of size 1 at addr ffff888115cbc330 by task modprobe/10128

CPU: 0 UID: 0 PID: 10128 Comm: modprobe 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_find+0x2cf2/0x5400
 xfrm_resolve_and_create_bundle+0x768/0x2f80
 xfrm_lookup_with_ifid+0x58a/0x1a70
 xfrm_lookup_route+0x3c/0x1c0
 igmpv3_newpack+0x27d/0x11a0
 add_grhead+0x70/0x340
 add_grec+0x1122/0x13e0
 igmp_ifc_timer_expire+0x978/0xde0
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 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:kasan_poison+0x4/0x60
Code: c0 5b 41 5c 41 5e 41 5f e9 99 35 5a 09 cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <40> f6 c7 07 75 36 48 89 f0 a8 07 75 39 48 89 f9 48 c1 e9 03 49 b8
RSP: 0018:ffffc9000404f5e0 EFLAGS: 00000246
RAX: 0000000000000020 RBX: ffff88810d9b4780 RCX: 0000000000000000
RDX: 00000000000000fc RSI: 0000000000000008 RDI: ffff88810d9b4798
RBP: 0000000000002800 R08: 0000000000002800 R09: 00000000ffffffff
R10: ffff88810d9b4780 R11: fffffbfff1f47247 R12: 0000000000000020
R13: ffff88810d9b4780 R14: ffff88801a441780 R15: 0000000000000018
 __kasan_kmalloc+0x7f/0xb0
 __kmalloc_cache_noprof+0x230/0x3d0
 kmem_cache_free+0x166/0x400
 vms_complete_munmap_vmas+0x626/0x8a0
 mmap_region+0x11db/0x20c0
 do_mmap+0xc45/0x10d0
 vm_mmap_pgoff+0x2a6/0x4d0
 ksys_mmap_pgoff+0x51f/0x760
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa4aad3bb74
Code: 63 08 44 89 e8 5b 41 5c 41 5d c3 41 89 ca 41 f7 c1 ff 0f 00 00 74 0c c7 05 f5 46 01 00 16 00 00 00 eb 17 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 0c f7 d8 89 05 dc 46 01 00 48 83 c8 ff c3 0f
RSP: 002b:00007ffda92760d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007ffda9276118 RCX: 00007fa4aad3bb74
RDX: 0000000000000005 RSI: 0000000000006000 RDI: 00007fa4aaa95000
RBP: 00007ffda92764b0 R08: 0000000000000000 R09: 0000000000003000
R10: 0000000000000812 R11: 0000000000000246 R12: 00007fa4aad16a00
R13: 00007ffda9276538 R14: 0000000000002ee0 R15: 0000000000000000
 </TASK>

Allocated by task 6803:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 xfrm_state_alloc+0x24/0x2f0
 __find_acq_core+0x8a7/0x1c00
 xfrm_find_acq+0x78/0xa0
 xfrm_alloc_userspi+0x6b3/0xc90
 xfrm_user_rcv_msg+0x7a3/0xab0
 netlink_rcv_skb+0x208/0x470
 xfrm_netlink_rcv+0x79/0x90
 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

Freed by task 47:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kmem_cache_free+0x18f/0x400
 xfrm_state_gc_task+0x52d/0x6b0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30

The buggy address belongs to the object at ffff888115cbc000
 which belongs to the cache xfrm_state of size 928
The buggy address is located 816 bytes inside of
 freed 928-byte region [ffff888115cbc000, ffff888115cbc3a0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888115cbd680 pfn:0x115cbc
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff88801d3503c0 dead000000000122 0000000000000000
raw: ffff888115cbd680 00000000800e000a 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff88801d3503c0 dead000000000122 0000000000000000
head: ffff888115cbd680 00000000800e000a 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea0004572f01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6803, tgid 6802 (syz.0.214), ts 71974631992, free_ts 66736148291
 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/0x1420
 kmem_cache_alloc_noprof+0x283/0x3c0
 xfrm_state_alloc+0x24/0x2f0
 __find_acq_core+0x8a7/0x1c00
 xfrm_find_acq+0x78/0xa0
 xfrm_alloc_userspi+0x6b3/0xc90
 xfrm_user_rcv_msg+0x7a3/0xab0
 netlink_rcv_skb+0x208/0x470
 xfrm_netlink_rcv+0x79/0x90
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
page last free pid 6581 tgid 6581 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 __put_partials+0x156/0x1a0
 put_cpu_partial+0x17c/0x250
 __slab_free+0x2d5/0x3c0
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_node_noprof+0x21b/0x4e0
 allocate_slab+0x16a/0x370
 ___slab_alloc+0xbeb/0x1420
 kmem_cache_alloc_noprof+0x283/0x3c0
 vm_area_dup+0x2b/0x680
 __split_vma+0x1a9/0xa00
 vms_gather_munmap_vmas+0x4ce/0x12f0
 mmap_region+0x724/0x20c0
 do_mmap+0xc45/0x10d0

Memory state around the buggy address:
 ffff888115cbc200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888115cbc280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888115cbc300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff888115cbc380: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888115cbc400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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