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BUG: KASAN: slab-use-after-free in xfrm_state_find+0x2cf2/0x5400
Read of size 1 at addr ffff88810fd03db0 by task syz.0.7485/23864

CPU: 1 UID: 0 PID: 23864 Comm: syz.0.7485 Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895 #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:
 <TASK>
 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
 icmpv6_route_lookup+0x155/0x590
 icmp6_send+0x1001/0x1940
 ip6_link_failure+0x3b/0x4c0
 ip6_tnl_xmit+0xe08/0x2b10
 ip6_tnl_start_xmit+0xc1d/0x1150
 dev_hard_start_xmit+0x2d7/0x830
 sch_direct_xmit+0x241/0x4b0
 __qdisc_run+0xb16/0x15f0
 __dev_queue_xmit+0x1056/0x3b50
 ip6_finish_output2+0x11fe/0x16a0
 ip6_fragment+0x1422/0x1e20
 ip6_xmit+0x107a/0x1840
 sctp_v6_xmit+0xa33/0x1300
 sctp_packet_transmit+0x2581/0x2bb0
 sctp_packet_singleton+0x233/0x330
 sctp_outq_flush+0x4f0/0x3140
 sctp_do_sm+0x5332/0x5a20
 sctp_primitive_ASSOCIATE+0x95/0xc0
 sctp_sendmsg_to_asoc+0x102d/0x1810
 sctp_sendmsg+0x1941/0x2810
 __sock_sendmsg+0x19c/0x270
 __sys_sendto+0x3bd/0x520
 __x64_sys_sendto+0xde/0x100
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa883f8ebe9
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:00007fa884e20038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fa8841b5fa0 RCX: 00007fa883f8ebe9
RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000003
RBP: 00007fa884011e19 R08: 0000200000000080 R09: 000000000000001c
R10: 0000000000000051 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa8841b6038 R14: 00007fa8841b5fa0 R15: 00007ffd4ccf6de8
 </TASK>

Allocated by task 22006:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 xfrm_state_alloc+0x24/0x2f0
 xfrm_state_find+0x37d4/0x5400
 xfrm_resolve_and_create_bundle+0x768/0x2f80
 xfrm_lookup_with_ifid+0x2a7/0x1a70
 xfrm_lookup_route+0x3c/0x1c0
 rawv6_sendmsg+0xdab/0x1820
 __sock_sendmsg+0x19c/0x270
 ____sys_sendmsg+0x52d/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __sys_sendmmsg+0x227/0x430
 __x64_sys_sendmmsg+0xa0/0xc0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 792:
 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 ffff88810fd03a80
 which belongs to the cache xfrm_state of size 928
The buggy address is located 816 bytes inside of
 freed 928-byte region [ffff88810fd03a80, ffff88810fd03e20)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88810fd01f80 pfn:0x10fd00
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000240(workingset|head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000240 ffff888100030780 ffff88810002d708 ffffea0004809810
raw: ffff88810fd01f80 00000000000e0001 00000000f5000000 0000000000000000
head: 057ff00000000240 ffff888100030780 ffff88810002d708 ffffea0004809810
head: ffff88810fd01f80 00000000000e0001 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea00043f4001 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 6728, tgid 6727 (syz.1.300), ts 82526425131, free_ts 56812575295
 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
 kmem_cache_alloc_noprof+0x283/0x3c0
 xfrm_state_alloc+0x24/0x2f0
 xfrm_state_find+0x37d4/0x5400
 xfrm_resolve_and_create_bundle+0x768/0x2f80
 xfrm_lookup_with_ifid+0x2a7/0x1a70
 xfrm_lookup_route+0x3c/0x1c0
 rawv6_sendmsg+0xdab/0x1820
 __sock_sendmsg+0x19c/0x270
 ____sys_sendmsg+0x52d/0x830
 ___sys_sendmsg+0x21f/0x2a0
page last free pid 5851 tgid 5851 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 __slab_free+0x303/0x3c0
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_noprof+0x224/0x4f0
 fib_create_info+0x1728/0x3210
 fib_table_insert+0xc6/0x1b50
 fib_magic+0x2c4/0x390
 fib_add_ifaddr+0x3fb/0x5f0
 fib_netdev_event+0x382/0x490
 notifier_call_chain+0x1b6/0x3e0
 __dev_notify_flags+0x18d/0x2e0
 netif_change_flags+0xe8/0x1a0
 do_setlink+0xc55/0x41c0
 rtnl_newlink+0x160b/0x1c70

Memory state around the buggy address:
 ffff88810fd03c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88810fd03d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88810fd03d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff88810fd03e00: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88810fd03e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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