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BUG: KASAN: use-after-free in sk_psock_unlink+0x4fa/0x580 net/core/sock_map.c:993
Read of size 4 at addr ffff8880a3736ad8 by task syz-executor.1/2144

CPU: 1 PID: 2144 Comm: syz-executor.1 Not tainted 5.2.0+ #21
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+0x6d/0x310 mm/kasan/report.c:188
 __kasan_report+0x14b/0x1c0 mm/kasan/report.c:317
 kasan_report+0x26/0x50 mm/kasan/common.c:614
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131
 sk_psock_unlink+0x4fa/0x580 net/core/sock_map.c:993
 tcp_bpf_remove net/ipv4/tcp_bpf.c:535 [inline]
 tcp_bpf_close+0x183/0x2f0 net/ipv4/tcp_bpf.c:575
 inet_release+0x158/0x1b0 net/ipv4/af_inet.c:427
 inet6_release+0x57/0x70 net/ipv6/af_inet6.c:470
 __sock_release net/socket.c:601 [inline]
 sock_close+0xdb/0x280 net/socket.c:1273
 __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:185 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:163 [inline]
 prepare_exit_to_usermode+0x43a/0x560 arch/x86/entry/common.c:194
 syscall_return_slowpath+0x110/0x440 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: 0033:0x4134b1
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:00007ffccd6963e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 00000000004134b1
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 0000000000000000 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 00007ffccd6964c0 R11: 0000000000000293 R12: 000000000075bfc8
R13: 000000000006cb04 R14: 00000000007610a8 R15: ffffffffffffffff

Allocated by task 2149:
 save_stack mm/kasan/common.c:71 [inline]
 set_track mm/kasan/common.c:79 [inline]
 __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:489
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:503
 kmem_cache_alloc_trace+0x20b/0x2c0 mm/slab.c:3555
 kmalloc include/linux/slab.h:547 [inline]
 kzalloc include/linux/slab.h:742 [inline]
 sock_map_alloc+0x156/0x3b0 net/core/sock_map.c:38
 find_and_alloc_map kernel/bpf/syscall.c:121 [inline]
 map_create kernel/bpf/syscall.c:562 [inline]
 __do_sys_bpf+0x39ec/0xc5d0 kernel/bpf/syscall.c:2795
 __se_sys_bpf kernel/bpf/syscall.c:2772 [inline]
 __x64_sys_bpf+0x7a/0x90 kernel/bpf/syscall.c:2772
 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 30119:
 save_stack mm/kasan/common.c:71 [inline]
 set_track mm/kasan/common.c:79 [inline]
 __kasan_slab_free+0x12a/0x1e0 mm/kasan/common.c:451
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459
 __cache_free mm/slab.c:3432 [inline]
 kfree+0xae/0x120 mm/slab.c:3755
 sock_map_free+0x276/0x2b0 net/core/sock_map.c:256
 bpf_map_free_deferred+0xaf/0xd0 kernel/bpf/syscall.c:302
 process_one_work+0x82b/0x1140 kernel/workqueue.c:2269
 worker_thread+0xc01/0x1640 kernel/workqueue.c:2415
 kthread+0x325/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff8880a3736ac0
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 512-byte region [ffff8880a3736ac0, ffff8880a3736cc0)
The buggy address belongs to the page:
page:ffffea00028dcd80 refcount:1 mapcount:0 mapping:ffff8880aa400940 index:0xffff8880a3736340
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea00024e0588 ffffea0002a4bec8 ffff8880aa400940
raw: ffff8880a3736340 ffff8880a37360c0 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a3736980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a3736a00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8880a3736a80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                                    ^
 ffff8880a3736b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a3736b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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