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BUG: KASAN: use-after-free in sk_psock_unlink+0x3dd/0x4b0 net/core/sock_map.c:993
Read of size 4 at addr ffff88809b76e098 by task syz-executor.2/7955

CPU: 1 PID: 7955 Comm: syz-executor.2 Not tainted 5.2.0-rc2 #4
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+0x172/0x1f0 lib/dump_stack.c:113
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:188
 __kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 kasan_report+0x12/0x20 mm/kasan/common.c:614
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131
 sk_psock_unlink+0x3dd/0x4b0 net/core/sock_map.c:993
 tcp_bpf_remove+0x21/0x50 net/ipv4/tcp_bpf.c:535
 tcp_bpf_close+0x130/0x390 net/ipv4/tcp_bpf.c:575
 inet_release+0xff/0x1e0 net/ipv4/af_inet.c:432
 inet6_release+0x53/0x80 net/ipv6/af_inet6.c:474
 __sock_release+0xce/0x2a0 net/socket.c:607
 sock_close+0x1b/0x30 net/socket.c:1279
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:168
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:279 [inline]
 do_syscall_64+0x58e/0x680 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x412f61
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:00007ffef2d6c3c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000412f61
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 0000000000000001 R08: 00000000c1a63e99 R09: 00000000c1a63e9d
R10: 00007ffef2d6c4a0 R11: 0000000000000293 R12: 00000000007610a8
R13: 00000000002ad9f8 R14: 00000000002ada25 R15: 000000000075bf2c

Allocated by task 7956:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_kmalloc mm/kasan/common.c:489 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:503
 kmem_cache_alloc_trace+0x151/0x750 mm/slab.c:3555
 kmalloc include/linux/slab.h:547 [inline]
 kzalloc include/linux/slab.h:742 [inline]
 sock_hash_alloc net/core/sock_map.c:802 [inline]
 sock_hash_alloc+0x1e3/0x5b0 net/core/sock_map.c:786
 find_and_alloc_map kernel/bpf/syscall.c:129 [inline]
 map_create kernel/bpf/syscall.c:570 [inline]
 __do_sys_bpf+0x730/0x43d0 kernel/bpf/syscall.c:2795
 __se_sys_bpf kernel/bpf/syscall.c:2772 [inline]
 __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2772
 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 5905:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459
 __cache_free mm/slab.c:3432 [inline]
 kfree+0xcf/0x220 mm/slab.c:3755
 sock_hash_free+0x327/0x4a0 net/core/sock_map.c:865
 bpf_map_free_deferred+0xb4/0xe0 kernel/bpf/syscall.c:310
 process_one_work+0x989/0x1790 kernel/workqueue.c:2269
 worker_thread+0x98/0xe40 kernel/workqueue.c:2415
 kthread+0x354/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff88809b76e080
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 512-byte region [ffff88809b76e080, ffff88809b76e280)
The buggy address belongs to the page:
page:ffffea00026ddb80 refcount:1 mapcount:0 mapping:ffff8880aa400940 index:0x0
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea0001b5adc8 ffffea00021e7288 ffff8880aa400940
raw: 0000000000000000 ffff88809b76e080 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809b76df80: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809b76e000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88809b76e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff88809b76e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809b76e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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