================================================================== 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 ffff888094d50280 by task blkid/10386 CPU: 1 PID: 10386 Comm: blkid 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: __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 RIP: 0033:0x7f7e1d994cf4 Code: 00 4c 8d 6c 24 1f 4c 8d 64 24 1e c6 44 24 1f 00 c6 44 24 1e 00 41 be 01 00 00 00 c7 44 24 0c 01 00 00 00 b8 02 00 00 00 0f a2 <41> 83 fe 01 89 54 24 08 41 89 cf 74 67 4c 89 e9 4c 89 e2 89 c6 89 RSP: 002b:00007ffd98bc55e0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: 0000000076036301 RBX: 0000000000f0b5ff RCX: 0000000000000000 RDX: 0000000000c10000 RSI: 000000000000000d RDI: 00000000000000bc RBP: 00000000000000bc R08: 00000000000001ff R09: 0000000000000008 R10: 00007ffd98bc5400 R11: 00007ffd98bc5400 R12: 00007ffd98bc55fe R13: 00007ffd98bc55ff R14: 0000000000000001 R15: 0000000000000002 Allocated by task 10187: 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 9744: 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 kvfree+0x4a/0x60 mm/util.c:603 __vunmap+0x6ba/0x950 mm/vmalloc.c:2319 __vfree+0x41/0xd0 mm/vmalloc.c:2363 vfree+0x5f/0x90 mm/vmalloc.c:2393 copy_entries_to_user net/ipv4/netfilter/arp_tables.c:712 [inline] get_entries net/ipv4/netfilter/arp_tables.c:867 [inline] do_arpt_get_ctl+0x681/0x820 net/ipv4/netfilter/arp_tables.c:1489 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x7a/0xd0 net/netfilter/nf_sockopt.c:122 ip_getsockopt net/ipv4/ip_sockglue.c:1576 [inline] ip_getsockopt+0x176/0x1d0 net/ipv4/ip_sockglue.c:1556 tcp_getsockopt net/ipv4/tcp.c:3690 [inline] tcp_getsockopt+0x8f/0xe0 net/ipv4/tcp.c:3684 sock_common_getsockopt+0x94/0xd0 net/core/sock.c:3108 __sys_getsockopt+0x16d/0x310 net/socket.c:2175 __do_sys_getsockopt net/socket.c:2190 [inline] __se_sys_getsockopt net/socket.c:2187 [inline] __x64_sys_getsockopt+0xbe/0x150 net/socket.c:2187 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888094d50280 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of 32-byte region [ffff888094d50280, ffff888094d502a0) The buggy address belongs to the page: page:ffffea0002535400 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff888094d50fc1 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002a3c288 ffffea00028deb48 ffff8880aa4001c0 raw: ffff888094d50fc1 ffff888094d50000 0000000100000033 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888094d50180: 00 00 00 03 fc fc fc fc fb fb fb fb fc fc fc fc ffff888094d50200: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc >ffff888094d50280: 04 fc fc fc fc fc fc fc 00 00 00 07 fc fc fc fc ^ ffff888094d50300: fb fb fb fb fc fc fc fc 00 00 00 03 fc fc fc fc ffff888094d50380: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================