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BUG: KASAN: slab-out-of-bounds in xfrm_alloc_spi+0x570/0xf30
Read of size 4 at addr ffff8880353efb44 by task syz.0.5602/18798

CPU: 1 UID: 0 PID: 18798 Comm: syz.0.5602 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:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 xfrm_alloc_spi+0x570/0xf30
 pfkey_getspi+0x7a8/0xee0
 pfkey_sendmsg+0xbfe/0x1090
 __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: 0033:0x7f7b8078ebe9
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:00007f7b815b4038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f7b809b5fa0 RCX: 00007f7b8078ebe9
RDX: 0000000020000000 RSI: 0000200000000040 RDI: 0000000000000003
RBP: 00007f7b80811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7b809b6038 R14: 00007f7b809b5fa0 R15: 00007ffe88bf27b8
 </TASK>

Allocated by task 8117:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x1bb/0x3c0
 kmalloc_reserve+0xbd/0x290
 __alloc_skb+0x142/0x2d0
 __ipv6_ifa_notify+0x1e8/0xac0
 addrconf_dad_completed+0x180/0xd60
 addrconf_dad_work+0xc36/0x14b0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30

Freed by task 8117:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kmem_cache_free+0x18f/0x400
 skb_release_data+0x62d/0x7c0
 consume_skb+0x9e/0xf0
 netlink_broadcast_filtered+0x1188/0x12c0
 nlmsg_notify+0xf0/0x1a0
 __ipv6_ifa_notify+0x236/0xac0
 addrconf_dad_completed+0x180/0xd60
 addrconf_dad_work+0xc36/0x14b0
 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 ffff8880353ef800
 which belongs to the cache skbuff_small_head of size 704
The buggy address is located 132 bytes to the right of
 allocated 704-byte region [ffff8880353ef800, ffff8880353efac0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x353ec
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801cecfc80 ffffea00010ae400 dead000000000004
raw: 0000000000000000 0000000000120012 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801cecfc80 ffffea00010ae400 dead000000000004
head: 0000000000000000 0000000000120012 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000d4fb01 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5817, tgid 5817 (sshd), ts 245146881854, free_ts 243616562253
 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_node_noprof+0x280/0x3c0
 kmalloc_reserve+0xbd/0x290
 __alloc_skb+0x142/0x2d0
 __tcp_send_ack+0xaf/0x620
 tcp_recvmsg_locked+0x2d7f/0x3660
 tcp_recvmsg+0x216/0x810
 inet_recvmsg+0x147/0x250
 sock_recvmsg+0x1a8/0x270
 sock_read_iter+0x231/0x2f0
 vfs_read+0x55a/0xa30
page last free pid 36 tgid 36 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 vfree+0x25a/0x400
 htab_map_free+0x7b2/0x980
 bpf_map_free_deferred+0x113/0x140
 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:
 ffff8880353efa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880353efa80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8880353efb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                           ^
 ffff8880353efb80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880353efc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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