================================================================== 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_list+0x40d/0xdd0 net/netfilter/ipset/ip_set_bitmap_gen.h:222 Read of size 8 at addr ffff8880a7e4a440 by task syz-executor.4/4263 CPU: 0 PID: 4263 Comm: syz-executor.4 Not tainted 5.5.0-rc7-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+0x1fb/0x318 lib/dump_stack.c:118 print_address_description+0x74/0x5c0 mm/kasan/report.c:374 __kasan_report+0x149/0x1c0 mm/kasan/report.c:506 kasan_report+0x26/0x50 mm/kasan/common.c:639 check_memory_region_inline mm/kasan/generic.c:182 [inline] check_memory_region+0x2b6/0x2f0 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_list+0x40d/0xdd0 net/netfilter/ipset/ip_set_bitmap_gen.h:222 ip_set_dump_start+0x10f9/0x1800 net/netfilter/ipset/ip_set_core.c:1632 netlink_dump+0x4ed/0x1170 net/netlink/af_netlink.c:2244 __netlink_dump_start+0x5cb/0x7b0 net/netlink/af_netlink.c:2352 netlink_dump_start include/linux/netlink.h:233 [inline] ip_set_dump+0x107/0x160 net/netfilter/ipset/ip_set_core.c:1690 nfnetlink_rcv_msg+0x9ae/0xcd0 net/netfilter/nfnetlink.c:229 netlink_rcv_skb+0x19e/0x3e0 net/netlink/af_netlink.c:2477 nfnetlink_rcv+0x1e0/0x1e50 net/netfilter/nfnetlink.c:563 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x767/0x920 net/netlink/af_netlink.c:1328 netlink_sendmsg+0xa2c/0xd50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:639 [inline] sock_sendmsg net/socket.c:659 [inline] ____sys_sendmsg+0x4f7/0x7f0 net/socket.c:2330 ___sys_sendmsg net/socket.c:2384 [inline] __sys_sendmsg+0x1ed/0x290 net/socket.c:2417 __do_sys_sendmsg net/socket.c:2426 [inline] __se_sys_sendmsg net/socket.c:2424 [inline] __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2424 do_syscall_64+0xf7/0x1c0 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:00007f46ccb6bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f46ccb6c6d4 RCX: 000000000045b349 RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000008e5 R14: 00000000004ca3c3 R15: 000000000075bf2c Allocated by task 24692: save_stack mm/kasan/common.c:72 [inline] set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc+0x118/0x1c0 mm/kasan/common.c:513 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x254/0x340 mm/slab.c:3665 kmalloc include/linux/slab.h:561 [inline] kzalloc+0x21/0x40 include/linux/slab.h:670 ip_set_alloc+0x32/0x60 net/netfilter/ipset/ip_set_core.c:255 init_map_ipmac net/netfilter/ipset/ip_set_bitmap_ipmac.c:302 [inline] bitmap_ipmac_create+0x3d9/0x840 net/netfilter/ipset/ip_set_bitmap_ipmac.c:365 ip_set_create+0x421/0xfd0 net/netfilter/ipset/ip_set_core.c:1111 nfnetlink_rcv_msg+0x9ae/0xcd0 net/netfilter/nfnetlink.c:229 netlink_rcv_skb+0x19e/0x3e0 net/netlink/af_netlink.c:2477 nfnetlink_rcv+0x1e0/0x1e50 net/netfilter/nfnetlink.c:563 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x767/0x920 net/netlink/af_netlink.c:1328 netlink_sendmsg+0xa2c/0xd50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:639 [inline] sock_sendmsg net/socket.c:659 [inline] ____sys_sendmsg+0x4f7/0x7f0 net/socket.c:2330 ___sys_sendmsg net/socket.c:2384 [inline] __sys_sendmsg+0x1ed/0x290 net/socket.c:2417 __do_sys_sendmsg net/socket.c:2426 [inline] __se_sys_sendmsg net/socket.c:2424 [inline] __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2424 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8893: save_stack mm/kasan/common.c:72 [inline] set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:335 [inline] __kasan_slab_free+0x12e/0x1e0 mm/kasan/common.c:474 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483 __cache_free mm/slab.c:3426 [inline] kfree+0x10d/0x220 mm/slab.c:3757 kvfree+0x46/0x50 mm/util.c:603 __vunmap+0x975/0xa10 mm/vmalloc.c:2311 __vfree mm/vmalloc.c:2355 [inline] vfree+0x85/0x130 mm/vmalloc.c:2385 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:867 [inline] get_entries net/ipv4/netfilter/ip_tables.c:1024 [inline] do_ipt_get_ctl+0x790/0x9b0 net/ipv4/netfilter/ip_tables.c:1700 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x27b/0x2a0 net/netfilter/nf_sockopt.c:122 ip_getsockopt+0x10b/0x1f0 net/ipv4/ip_sockglue.c:1576 tcp_getsockopt+0xbe/0xd0 net/ipv4/tcp.c:3690 sock_common_getsockopt+0x99/0xb0 net/core/sock.c:3108 __sys_getsockopt+0x24c/0x2b0 net/socket.c:2162 __do_sys_getsockopt net/socket.c:2177 [inline] __se_sys_getsockopt net/socket.c:2174 [inline] __x64_sys_getsockopt+0xbf/0xd0 net/socket.c:2174 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a7e4a440 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of 32-byte region [ffff8880a7e4a440, ffff8880a7e4a460) The buggy address belongs to the page: page:ffffea00029f9280 refcount:1 mapcount:0 mapping:ffff8880aa8001c0 index:0xffff8880a7e4afc1 raw: 00fffe0000000200 ffffea0000e8fd08 ffffea00014ceb88 ffff8880aa8001c0 raw: ffff8880a7e4afc1 ffff8880a7e4a000 000000010000003e 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a7e4a300: 05 fc fc fc fc fc fc fc 06 fc fc fc fc fc fc fc ffff8880a7e4a380: 00 fc fc fc fc fc fc fc 06 fc fc fc fc fc fc fc >ffff8880a7e4a400: fb fb fb fb fc fc fc fc 04 fc fc fc fc fc fc fc ^ ffff8880a7e4a480: fb fb fb fb fc fc fc fc 05 fc fc fc fc fc fc fc ffff8880a7e4a500: 00 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================