syzbot

device lo left promiscuous mode
device lo entered promiscuous mode
IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready
IPVS: set_ctl: invalid protocol: 98 0.0.0.6:20000 lc
==================================================================
BUG: KASAN: double-free or invalid-free in dccp_feat_val_destructor+0xd2/0xf0 net/dccp/feat.c:388

CPU: 1 PID: 20208 Comm: syz-executor3 Not tainted 4.16.0-rc6+ #288
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:256
 kasan_report_invalid_free+0x55/0x80 mm/kasan/report.c:336
 __kasan_slab_free+0x145/0x170 mm/kasan/kasan.c:500
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527
 __cache_free mm/slab.c:3485 [inline]
 kfree+0xd9/0x260 mm/slab.c:3800
 dccp_feat_val_destructor+0xd2/0xf0 net/dccp/feat.c:388
 dccp_feat_entry_destructor.part.5+0x40/0x60 net/dccp/feat.c:417
 dccp_feat_entry_destructor net/dccp/feat.c:416 [inline]
 dccp_feat_list_purge+0xc2/0x1e0 net/dccp/feat.c:549
 dccp_destroy_sock+0x2f4/0x3f0 net/dccp/proto.c:239
 inet_csk_destroy_sock+0x166/0x3f0 net/ipv4/inet_connection_sock.c:831
 dccp_close+0x854/0xc20 net/dccp/proto.c:1089
 inet_release+0xed/0x1c0 net/ipv4/af_inet.c:427
 sock_release+0x8d/0x1e0 net/socket.c:594
 sock_close+0x16/0x20 net/socket.c:1149
 __fput+0x327/0x7e0 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ad0 kernel/exit.c:865
 do_group_exit+0x149/0x400 kernel/exit.c:968
 get_signal+0x73a/0x16d0 kernel/signal.c:2469
 do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_64+0x6ec/0x940 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x454e79
RSP: 002b:00007fd1ac4eace8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000072bf80 RCX: 0000000000454e79
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bf80
RBP: 000000000072bf80 R08: 0000000000000000 R09: 000000000072bf58
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000a3e81f R14: 00007fd1ac4eb9c0 R15: 0000000000000001

Allocated by task 4395:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552
 __do_kmalloc_node mm/slab.c:3669 [inline]
 __kmalloc_node+0x47/0x70 mm/slab.c:3676
 kmalloc_node include/linux/slab.h:554 [inline]
 __vmalloc_area_node mm/vmalloc.c:1686 [inline]
 __vmalloc_node_range+0x1a1/0x650 mm/vmalloc.c:1759
 __vmalloc_node mm/vmalloc.c:1804 [inline]
 __vmalloc_node_flags mm/vmalloc.c:1818 [inline]
 vzalloc+0x45/0x50 mm/vmalloc.c:1857
 alloc_counters.isra.11+0x9a/0x7d0 net/ipv4/netfilter/ip_tables.c:801
 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:823 [inline]
 get_entries net/ipv4/netfilter/ip_tables.c:1025 [inline]
 do_ipt_get_ctl+0x63b/0xac0 net/ipv4/netfilter/ip_tables.c:1701
 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline]
 nf_getsockopt+0x6a/0xc0 net/netfilter/nf_sockopt.c:122
 ip_getsockopt+0x152/0x200 net/ipv4/ip_sockglue.c:1564
 tcp_getsockopt+0x82/0xd0 net/ipv4/tcp.c:3338
 sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2998
 SYSC_getsockopt net/socket.c:1881 [inline]
 SyS_getsockopt+0x178/0x340 net/socket.c:1863
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 4395:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527
 __cache_free mm/slab.c:3485 [inline]
 kfree+0xd9/0x260 mm/slab.c:3800
 kvfree+0x36/0x60 mm/util.c:438
 __vunmap+0x2ac/0x380 mm/vmalloc.c:1542
 vfree+0x50/0xe0 mm/vmalloc.c:1606
 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:868 [inline]
 get_entries net/ipv4/netfilter/ip_tables.c:1025 [inline]
 do_ipt_get_ctl+0x7f5/0xac0 net/ipv4/netfilter/ip_tables.c:1701
 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline]
 nf_getsockopt+0x6a/0xc0 net/netfilter/nf_sockopt.c:122
 ip_getsockopt+0x152/0x200 net/ipv4/ip_sockglue.c:1564
 tcp_getsockopt+0x82/0xd0 net/ipv4/tcp.c:3338
 sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2998
 SYSC_getsockopt net/socket.c:1881 [inline]
 SyS_getsockopt+0x178/0x340 net/socket.c:1863
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff8801d788ec80
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff8801d788ec80, ffff8801d788eca0)
The buggy address belongs to the page:
page:ffffea00075e2380 count:1 mapcount:0 mapping:ffff8801d788e000 index:0xffff8801d788efc1
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801d788e000 ffff8801d788efc1 0000000100000030
raw: ffffea000740bd60 ffffea0006f4fd60 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d788eb80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801d788ec00: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc
>ffff8801d788ec80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
                   ^
 ffff8801d788ed00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801d788ed80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================