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BUG: KASAN: slab-out-of-bounds in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline]
BUG: KASAN: slab-out-of-bounds in bitmap_ip_gc_test net/netfilter/ipset/ip_set_bitmap_ip.c:76 [inline]
BUG: KASAN: slab-out-of-bounds in bitmap_ip_gc+0x100/0x4f0 net/netfilter/ipset/ip_set_bitmap_gen.h:277
Read of size 8 at addr ffff8880958a9bc0 by task syz-executor979/9860

CPU: 0 PID: 9860 Comm: syz-executor979 Not tainted 5.5.0-rc6-next-20200116-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x32 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:641
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192
 __kasan_check_read+0x11/0x20 mm/kasan/common.c:95
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline]
 bitmap_ip_gc_test net/netfilter/ipset/ip_set_bitmap_ip.c:76 [inline]
 bitmap_ip_gc+0x100/0x4f0 net/netfilter/ipset/ip_set_bitmap_gen.h:277
 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19b/0x1e0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:do_user_addr_fault arch/x86/mm/fault.c:1362 [inline]
RIP: 0010:do_page_fault+0xa31/0x12e1 arch/x86/mm/fault.c:1539
Code: ff df 48 c1 e8 03 80 3c 10 00 0f 85 af 07 00 00 48 83 3d e9 b4 7f 08 00 0f 84 06 06 00 00 e8 26 92 41 00 fb 66 0f 1f 44 00 00 <c7> 45 c0 54 00 00 00 e9 6e f8 ff ff e8 0e 92 41 00 48 8b 45 c8 48
RSP: 0000:ffffc90007e47ed8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffff88809bfd8600 RBX: 00000000006d1000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff813405aa RDI: ffff88809bfd8e9c
RBP: ffffc90007e47f48 R08: ffff88809bfd8600 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000006d1680
R13: ffffc90007e47f58 R14: 0000000000000007 R15: ffffc90007e47fe0
 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1203
RIP: 0033:0x43fee1
Code: 00 01 00 00 00 74 23 66 90 48 8b 03 48 8b 50 18 48 85 d2 74 05 ff d2 48 8b 03 48 8b 5b 08 c7 40 28 01 00 00 00 48 85 db 75 df <c7> 05 95 17 29 00 00 00 00 00 48 8d 65 e0 44 89 e8 5b 41 5c 41 5d
RSP: 002b:00007ffc58219090 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000043fdfa
RDX: 0000003926448565 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffc582190b0 R08: 0000000000000000 R09: 00000000013e6880
R10: 00000000013e6b50 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 9534:
 save_stack+0x23/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc mm/kasan/common.c:515 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:488
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:529
 __do_kmalloc mm/slab.c:3656 [inline]
 __kmalloc+0x163/0x770 mm/slab.c:3665
 kmalloc include/linux/slab.h:560 [inline]
 kzalloc include/linux/slab.h:669 [inline]
 ip_set_alloc+0x38/0x5e net/netfilter/ipset/ip_set_core.c:255
 init_map_ip net/netfilter/ipset/ip_set_bitmap_ip.c:223 [inline]
 bitmap_ip_create+0x6ec/0xc20 net/netfilter/ipset/ip_set_bitmap_ip.c:327
 ip_set_create+0x6f1/0x1500 net/netfilter/ipset/ip_set_core.c:1111
 nfnetlink_rcv_msg+0xcf2/0xfb0 net/netfilter/nfnetlink.c:229
 netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
 nfnetlink_rcv+0x1ba/0x460 net/netfilter/nfnetlink.c:563
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x59e/0x7e0 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:672
 ____sys_sendmsg+0x753/0x880 net/socket.c:2343
 ___sys_sendmsg+0x100/0x170 net/socket.c:2397
 __sys_sendmsg+0x105/0x1d0 net/socket.c:2430
 __do_sys_sendmsg net/socket.c:2439 [inline]
 __se_sys_sendmsg net/socket.c:2437 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 4232:
 save_stack+0x23/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 kasan_set_free_info mm/kasan/common.c:337 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:476
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:485
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x2c0 mm/slab.c:3757
 tty_ldisc_put+0x4e/0x80 drivers/tty/tty_ldisc.c:205
 tty_ldisc_kill+0xc3/0x160 drivers/tty/tty_ldisc.c:638
 tty_ldisc_release+0xe9/0x2b0 drivers/tty/tty_ldisc.c:809
 tty_release_struct+0x1b/0x50 drivers/tty/tty_io.c:1616
 tty_release+0xbcb/0xe90 drivers/tty/tty_io.c:1789
 __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+0x316/0x380 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880958a9bc0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff8880958a9bc0, ffff8880958a9be0)
The buggy address belongs to the page:
page:ffffea0002562a40 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff8880958a9fc1
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0002790688 ffffea000255e6c8 ffff8880aa4001c0
raw: ffff8880958a9fc1 ffff8880958a9000 0000000100000029 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880958a9a80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880958a9b00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8880958a9b80: fb fb fb fb fc fc fc fc 04 fc fc fc fc fc fc fc
                                           ^
 ffff8880958a9c00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880958a9c80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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