================================================================== 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_ipmac_gc_test net/netfilter/ipset/ip_set_bitmap_ipmac.c:102 [inline] BUG: KASAN: slab-out-of-bounds in bitmap_ipmac_gc+0x119/0x590 net/netfilter/ipset/ip_set_bitmap_gen.h:277 Read of size 8 at addr ffff88809efb7580 by task syz-executor.0/18834 CPU: 0 PID: 18834 Comm: syz-executor.0 Not tainted 5.5.0-rc6-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/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:639 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_ipmac_gc_test net/netfilter/ipset/ip_set_bitmap_ipmac.c:102 [inline] bitmap_ipmac_gc+0x119/0x590 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: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:kmem_cache_free+0xab/0x320 mm/slab.c:3695 Code: e8 4a 29 00 00 84 c0 74 77 41 f7 c6 00 02 00 00 74 4f e8 68 20 c8 ff 48 83 3d 48 c9 e0 07 00 0f 84 fa 01 00 00 4c 89 f7 57 9d <0f> 1f 44 00 00 4c 8b 6d 08 0f 1f 44 00 00 65 8b 05 e8 48 4f 7e 83 RSP: 0018:ffffc9000623f900 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff8880924abc00 RCX: 0000000000000006 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000282 RBP: ffffc9000623f920 R08: 1ffffffff165e79f R09: fffffbfff165e7a0 R10: fffffbfff165e79f R11: ffffffff8b2f3cff R12: ffff88821b056000 R13: ffffffff861b745b R14: 0000000000000282 R15: ffff88806b1af000 kfree_skbmem net/core/skbuff.c:623 [inline] kfree_skbmem+0xfb/0x1c0 net/core/skbuff.c:617 __kfree_skb net/core/skbuff.c:680 [inline] consume_skb net/core/skbuff.c:838 [inline] consume_skb+0x103/0x410 net/core/skbuff.c:832 netlink_broadcast_filtered+0x34e/0xd20 net/netlink/af_netlink.c:1512 netlink_broadcast net/netlink/af_netlink.c:1534 [inline] nlmsg_multicast include/net/netlink.h:968 [inline] nlmsg_notify+0x93/0x250 net/netlink/af_netlink.c:2520 rtnl_notify net/core/rtnetlink.c:737 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:3702 [inline] rtmsg_ifinfo_event.part.0+0xb0/0xe0 net/core/rtnetlink.c:3717 rtmsg_ifinfo_event net/core/rtnetlink.c:3725 [inline] rtmsg_ifinfo+0x8d/0xa0 net/core/rtnetlink.c:3723 register_netdevice+0x7d8/0x1060 net/core/dev.c:9360 register_netdev+0x30/0x50 net/core/dev.c:9439 vti6_init_net+0x50e/0x810 net/ipv6/ip6_vti.c:1131 ops_init+0xb3/0x420 net/core/net_namespace.c:137 setup_net+0x2d5/0x8b0 net/core/net_namespace.c:335 copy_net_ns+0x29e/0x5a0 net/core/net_namespace.c:476 create_new_namespaces+0x400/0x860 kernel/nsproxy.c:103 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:202 ksys_unshare+0x444/0x980 kernel/fork.c:2945 __do_sys_unshare kernel/fork.c:3013 [inline] __se_sys_unshare kernel/fork.c:3011 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:3011 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b349 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f81ce28dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f81ce28e6d4 RCX: 000000000045b349 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000bdd R14: 00000000004ccc44 R15: 000000000075bf2c Allocated by task 18792: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x163/0x770 mm/slab.c:3665 kmalloc include/linux/slab.h:561 [inline] kzalloc include/linux/slab.h:670 [inline] ip_set_alloc+0x38/0x5e net/netfilter/ipset/ip_set_core.c:255 init_map_ipmac net/netfilter/ipset/ip_set_bitmap_ipmac.c:302 [inline] bitmap_ipmac_create+0x4e8/0xa00 net/netfilter/ipset/ip_set_bitmap_ipmac.c:365 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+0x58c/0x7d0 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:639 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:659 ____sys_sendmsg+0x753/0x880 net/socket.c:2330 ___sys_sendmsg+0x100/0x170 net/socket.c:2384 __sys_sendmsg+0x105/0x1d0 net/socket.c:2417 __do_sys_sendmsg net/socket.c:2426 [inline] __se_sys_sendmsg net/socket.c:2424 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2424 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 11592: 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:335 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x2c0 mm/slab.c:3757 kvfree+0x61/0x70 mm/util.c:603 __vunmap+0x6ba/0x950 mm/vmalloc.c:2311 __vfree+0x41/0xd0 mm/vmalloc.c:2355 vfree+0x5f/0x90 mm/vmalloc.c:2385 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:883 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1041 [inline] do_ip6t_get_ctl+0x750/0x960 net/ipv6/netfilter/ip6_tables.c:1709 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x7a/0xd0 net/netfilter/nf_sockopt.c:122 ipv6_getsockopt net/ipv6/ipv6_sockglue.c:1400 [inline] ipv6_getsockopt+0x205/0x280 net/ipv6/ipv6_sockglue.c:1380 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:2162 __do_sys_getsockopt net/socket.c:2177 [inline] __se_sys_getsockopt net/socket.c:2174 [inline] __x64_sys_getsockopt+0xbe/0x150 net/socket.c:2174 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 ffff88809efb7580 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of 32-byte region [ffff88809efb7580, ffff88809efb75a0) The buggy address belongs to the page: page:ffffea00027bedc0 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff88809efb7fc1 raw: 00fffe0000000200 ffffea00027a1e08 ffffea00028cf508 ffff8880aa4001c0 raw: ffff88809efb7fc1 ffff88809efb7000 000000010000003e 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809efb7480: 05 fc fc fc fc fc fc fc 00 00 00 fc fc fc fc fc ffff88809efb7500: 05 fc fc fc fc fc fc fc 06 fc fc fc fc fc fc fc >ffff88809efb7580: 04 fc fc fc fc fc fc fc 00 fc fc fc fc fc fc fc ^ ffff88809efb7600: 05 fc fc fc fc fc fc fc 07 fc fc fc fc fc fc fc ffff88809efb7680: 06 fc fc fc fc fc fc fc 05 fc fc fc fc fc fc fc ==================================================================