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BUG: KASAN: use-after-free in sk_psock_unlink+0x4fa/0x580 net/core/sock_map.c:988
Read of size 4 at addr ffff8880a9241318 by task syz-executor.2/11441

CPU: 1 PID: 11441 Comm: syz-executor.2 Not tainted 5.3.0-rc3+ #66
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+0x1d8/0x2f8 lib/dump_stack.c:113
 print_address_description+0x75/0x5b0 mm/kasan/report.c:351
 __kasan_report+0x14b/0x1c0 mm/kasan/report.c:482
 kasan_report+0x26/0x50 mm/kasan/common.c:612
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131
 sk_psock_unlink+0x4fa/0x580 net/core/sock_map.c:988
 tcp_bpf_remove net/ipv4/tcp_bpf.c:535 [inline]
 tcp_bpf_close+0x183/0x2f0 net/ipv4/tcp_bpf.c:575
 inet_release+0x165/0x1c0 net/ipv4/af_inet.c:427
 inet6_release+0x57/0x70 net/ipv6/af_inet6.c:470
 __sock_release net/socket.c:590 [inline]
 sock_close+0xe1/0x260 net/socket.c:1268
 __fput+0x2e4/0x740 fs/file_table.c:280
 ____fput+0x15/0x20 fs/file_table.c:313
 task_work_run+0x17e/0x1b0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:163 [inline]
 prepare_exit_to_usermode+0x459/0x580 arch/x86/entry/common.c:194
 syscall_return_slowpath+0x113/0x4a0 arch/x86/entry/common.c:274
 do_syscall_64+0x126/0x140 arch/x86/entry/common.c:299
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413511
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffda45bdee0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000413511
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 0000000000000001 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 00007ffda45bdfc0 R11: 0000000000000293 R12: 000000000075bf20
R13: 0000000000014e73 R14: 00000000007610a8 R15: ffffffffffffffff

Allocated by task 11451:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:487
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:501
 kmem_cache_alloc_trace+0x221/0x2f0 mm/slab.c:3550
 kmalloc include/linux/slab.h:552 [inline]
 kzalloc include/linux/slab.h:748 [inline]
 sock_map_alloc+0x152/0x350 net/core/sock_map.c:38
 find_and_alloc_map kernel/bpf/syscall.c:121 [inline]
 map_create kernel/bpf/syscall.c:569 [inline]
 __do_sys_bpf+0x34d3/0xbf20 kernel/bpf/syscall.c:2831
 __se_sys_bpf kernel/bpf/syscall.c:2808 [inline]
 __x64_sys_bpf+0x7a/0x90 kernel/bpf/syscall.c:2808
 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 9646:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 __kasan_slab_free+0x12a/0x1e0 mm/kasan/common.c:449
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:457
 __cache_free mm/slab.c:3425 [inline]
 kfree+0x115/0x200 mm/slab.c:3756
 sock_map_free+0x276/0x2b0 net/core/sock_map.c:251
 bpf_map_free_deferred+0xb4/0x120 kernel/bpf/syscall.c:307
 process_one_work+0x7ef/0x10e0 kernel/workqueue.c:2269
 worker_thread+0xc01/0x1630 kernel/workqueue.c:2415
 kthread+0x332/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff8880a9241300
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 512-byte region [ffff8880a9241300, ffff8880a9241500)
The buggy address belongs to the page:
page:ffffea0002a49040 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0x0
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea00027e0248 ffffea00023fd648 ffff8880aa400a80
raw: 0000000000000000 ffff8880a9241080 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a9241200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a9241280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880a9241300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff8880a9241380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a9241400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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