netlink: 3 bytes leftover after parsing attributes in process `syz-executor6'. ================================================================== BUG: KASAN: slab-out-of-bounds in clusterip_config_init_nodelist net/ipv4/netfilter/ipt_CLUSTERIP.c:172 [inline] BUG: KASAN: slab-out-of-bounds in clusterip_config_init net/ipv4/netfilter/ipt_CLUSTERIP.c:227 [inline] BUG: KASAN: slab-out-of-bounds in clusterip_tg_check+0x150f/0x1570 net/ipv4/netfilter/ipt_CLUSTERIP.c:478 Read of size 2 at addr ffff8801d0c787c0 by task syz-executor2/10712 CPU: 1 PID: 10712 Comm: syz-executor2 Not tainted 4.15.0-rc9+ #214 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+0x194/0x257 lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x25b/0x340 mm/kasan/report.c:409 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:428 clusterip_config_init_nodelist net/ipv4/netfilter/ipt_CLUSTERIP.c:172 [inline] clusterip_config_init net/ipv4/netfilter/ipt_CLUSTERIP.c:227 [inline] clusterip_tg_check+0x150f/0x1570 net/ipv4/netfilter/ipt_CLUSTERIP.c:478 xt_check_target+0x22c/0x7d0 net/netfilter/x_tables.c:845 check_target net/ipv4/netfilter/ip_tables.c:518 [inline] find_check_entry.isra.8+0x8c8/0xcb0 net/ipv4/netfilter/ip_tables.c:559 translate_table+0xed1/0x1610 net/ipv4/netfilter/ip_tables.c:730 do_replace net/ipv4/netfilter/ip_tables.c:1146 [inline] do_ipt_set_ctl+0x370/0x5f0 net/ipv4/netfilter/ip_tables.c:1680 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ip_setsockopt+0xa1/0xb0 net/ipv4/ip_sockglue.c:1260 sctp_setsockopt+0x2b6/0x61d0 net/sctp/socket.c:4141 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x453299 RSP: 002b:00007fcef8351c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fcef8352700 RCX: 0000000000453299 RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000014 RBP: 0000000000000000 R08: 0000000000000504 R09: 0000000000000000 R10: 0000000020017000 R11: 0000000000000212 R12: 0000000000000000 R13: 0000000000a2f33f R14: 00007fcef83529c0 R15: 0000000000000000 Allocated by task 10712: 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:551 __do_kmalloc_node mm/slab.c:3672 [inline] __kmalloc_node+0x47/0x70 mm/slab.c:3679 kmalloc_node include/linux/slab.h:541 [inline] kvmalloc_node+0x99/0xd0 mm/util.c:397 kvmalloc include/linux/mm.h:541 [inline] xt_alloc_table_info+0x64/0xe0 net/netfilter/x_tables.c:1006 do_replace net/ipv4/netfilter/ip_tables.c:1135 [inline] do_ipt_set_ctl+0x29b/0x5f0 net/ipv4/netfilter/ip_tables.c:1680 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ip_setsockopt+0xa1/0xb0 net/ipv4/ip_sockglue.c:1260 sctp_setsockopt+0x2b6/0x61d0 net/sctp/socket.c:4141 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 entry_SYSCALL_64_fastpath+0x29/0xa0 Freed by task 3739: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3488 [inline] kfree+0xd6/0x260 mm/slab.c:3803 kvfree+0x36/0x60 mm/util.c:416 xt_free_table_info+0x110/0x170 net/netfilter/x_tables.c:1026 __do_replace+0x7fb/0xa50 net/ipv4/netfilter/ip_tables.c:1096 do_replace net/ipv4/netfilter/ip_tables.c:1150 [inline] do_ipt_set_ctl+0x40f/0x5f0 net/ipv4/netfilter/ip_tables.c:1680 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ip_setsockopt+0xa1/0xb0 net/ipv4/ip_sockglue.c:1260 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2896 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 entry_SYSCALL_64_fastpath+0x29/0xa0 The buggy address belongs to the object at ffff8801d0c784c0 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 768 bytes inside of 1024-byte region [ffff8801d0c784c0, ffff8801d0c788c0) The buggy address belongs to the page: page:ffffea0007431e00 count:1 mapcount:0 mapping:ffff8801d0c78040 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801d0c78040 0000000000000000 0000000100000007 raw: ffffea000702ae20 ffffea000745a7a0 ffff8801dac00ac0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d0c78680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801d0c78700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801d0c78780: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff8801d0c78800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801d0c78880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================