================================================================== BUG: KASAN: slab-out-of-bounds in ipt_init_target+0x213/0x250 net/sched/act_ipt.c:46 Read of size 1 at addr ffff8880b5369ddf by task syz-executor.5/18212 CPU: 1 PID: 18212 Comm: syz-executor.5 Not tainted 4.14.268-syzkaller #0 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+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load1_noabort+0x68/0x70 mm/kasan/report.c:427 ipt_init_target+0x213/0x250 net/sched/act_ipt.c:46 __tcf_ipt_init+0x48d/0xc00 net/sched/act_ipt.c:168 tcf_ipt_init+0x43/0x50 net/sched/act_ipt.c:202 tcf_action_init_1+0x51a/0x9e0 net/sched/act_api.c:691 Unknown ioctl 35123 tcf_action_init+0x26d/0x400 net/sched/act_api.c:760 tcf_action_add net/sched/act_api.c:1088 [inline] tc_ctl_action+0x2e3/0x510 net/sched/act_api.c:1140 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4322 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2446 netlink_unicast_kernel net/netlink/af_netlink.c:1294 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1320 netlink_sendmsg+0x648/0xbc0 net/netlink/af_netlink.c:1891 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fbb5789a049 RSP: 002b:00007fbb5620f168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fbb579acf60 RCX: 00007fbb5789a049 RDX: 0000000000000000 RSI: 0000000020005180 RDI: 0000000000000003 RBP: 00007fbb578f408d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc9a5e099f R14: 00007fbb5620f300 R15: 0000000000022000 Allocated by task 18212: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc_track_caller+0x155/0x400 mm/slab.c:3735 kmemdup+0x23/0x50 mm/util.c:118 kmemdup include/linux/string.h:449 [inline] __tcf_ipt_init+0x464/0xc00 net/sched/act_ipt.c:164 tcf_ipt_init+0x43/0x50 net/sched/act_ipt.c:202 tcf_action_init_1+0x51a/0x9e0 net/sched/act_api.c:691 tcf_action_init+0x26d/0x400 net/sched/act_api.c:760 tcf_action_add net/sched/act_api.c:1088 [inline] tc_ctl_action+0x2e3/0x510 net/sched/act_api.c:1140 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4322 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2446 netlink_unicast_kernel net/netlink/af_netlink.c:1294 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1320 netlink_sendmsg+0x648/0xbc0 net/netlink/af_netlink.c:1891 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 8000: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 kvfree+0x45/0x50 mm/util.c:416 translate_table+0x9dc/0x1410 net/ipv4/netfilter/ip_tables.c:732 do_replace net/ipv4/netfilter/ip_tables.c:1138 [inline] do_ipt_set_ctl+0x228/0x3a0 net/ipv4/netfilter/ip_tables.c:1676 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x5f/0xb0 net/netfilter/nf_sockopt.c:115 ip_setsockopt net/ipv4/ip_sockglue.c:1255 [inline] ip_setsockopt+0x94/0xb0 net/ipv4/ip_sockglue.c:1240 tcp_setsockopt+0x7b/0xc0 net/ipv4/tcp.c:2828 SYSC_setsockopt net/socket.c:1865 [inline] SyS_setsockopt+0x110/0x1e0 net/socket.c:1844 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff8880b5369dc0 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 31 bytes inside of 32-byte region [ffff8880b5369dc0, ffff8880b5369de0) The buggy address belongs to the page: page:ffffea0002d4da40 count:1 mapcount:0 mapping:ffff8880b5369000 index:0xffff8880b5369fc1 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffff8880b5369000 ffff8880b5369fc1 000000010000002c raw: ffffea00027a1060 ffffea0002742da0 ffff88813fe741c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880b5369c80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8880b5369d00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc >ffff8880b5369d80: fb fb fb fb fc fc fc fc 07 fc fc fc fc fc fc fc ^ ffff8880b5369e00: 00 04 fc fc fc fc fc fc 00 fc fc fc fc fc fc fc ffff8880b5369e80: 05 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================