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BUG: KASAN: use-after-free in cmpxchg_size include/asm-generic/atomic-instrumented.h:355 [inline]
BUG: KASAN: use-after-free in bpf_tcp_close+0x6f5/0xf80 kernel/bpf/sockmap.c:265
Write of size 8 at addr ffff8801aeb6d228 by task syz-executor6/17225

CPU: 1 PID: 17225 Comm: syz-executor6 Not tainted 4.17.0+ #39
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
 kasan_check_write+0x14/0x20 mm/kasan/kasan.c:278
 cmpxchg_size include/asm-generic/atomic-instrumented.h:355 [inline]
 bpf_tcp_close+0x6f5/0xf80 kernel/bpf/sockmap.c:265
 inet_release+0x104/0x1f0 net/ipv4/af_inet.c:427
 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:459
 __sock_release+0xd7/0x260 net/socket.c:603
 sock_close+0x19/0x20 net/socket.c:1186
 __fput+0x353/0x890 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1e4/0x290 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1aee/0x2730 kernel/exit.c:865
 do_group_exit+0x16f/0x430 kernel/exit.c:968
 get_signal+0x886/0x1960 kernel/signal.c:2468
 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x2cf/0x360 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6ac/0x800 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a99
Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007ff0c35d9ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000072bf68 RCX: 0000000000455a99
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bf68
RBP: 000000000072bf68 R08: 0000000000000000 R09: 000000000072bf48
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd16cd7fdf R14: 00007ff0c35da9c0 R15: 0000000000000001

Allocated by task 17220:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 __do_kmalloc_node mm/slab.c:3682 [inline]
 __kmalloc_node+0x47/0x70 mm/slab.c:3689
 kmalloc_node include/linux/slab.h:555 [inline]
 bpf_map_area_alloc+0x3f/0x90 kernel/bpf/syscall.c:147
 sock_map_alloc+0x376/0x410 kernel/bpf/sockmap.c:1555
 find_and_alloc_map kernel/bpf/syscall.c:129 [inline]
 map_create+0x393/0x1010 kernel/bpf/syscall.c:453
 __do_sys_bpf kernel/bpf/syscall.c:2351 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:2328 [inline]
 __x64_sys_bpf+0x303/0x510 kernel/bpf/syscall.c:2328
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 20601:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xd9/0x260 mm/slab.c:3813
 kvfree+0x61/0x70 mm/util.c:442
 bpf_map_area_free+0x15/0x20 kernel/bpf/syscall.c:158
 sock_map_remove_complete kernel/bpf/sockmap.c:1443 [inline]
 sock_map_free+0x408/0x540 kernel/bpf/sockmap.c:1619
 bpf_map_free_deferred+0xba/0xf0 kernel/bpf/syscall.c:262
 process_one_work+0xc64/0x1b70 kernel/workqueue.c:2153
 worker_thread+0x181/0x13a0 kernel/workqueue.c:2296
 kthread+0x345/0x410 kernel/kthread.c:240
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412

The buggy address belongs to the object at ffff8801aeb6d200
 which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 40 bytes inside of
 1024-byte region [ffff8801aeb6d200, ffff8801aeb6d600)
The buggy address belongs to the page:
page:ffffea0006badb00 count:1 mapcount:0 mapping:ffff8801da800ac0 index:0xffff8801aeb6c900 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffffea00066ea308 ffffea0006bb3b08 ffff8801da800ac0
raw: ffff8801aeb6c900 ffff8801aeb6c000 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801aeb6d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801aeb6d180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801aeb6d200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff8801aeb6d280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801aeb6d300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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