IPVS: set_ctl: invalid protocol: 45975 236.44.193.237:56990  IPVS: set_ctl: invalid protocol: 45975 236.44.193.237:56990  ================================================================== BUG: KASAN: stack-out-of-bounds in strnlen+0xc1/0xd0 lib/string.c:498 Read of size 1 at addr ffff8801d0877d04 by task syzkaller968690/3469 CPU: 0 PID: 3469 Comm: syzkaller968690 Not tainted 4.4.107-g610c835 #12 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 32c3afb9a0a8afa3 ffff8801d0877758 ffffffff81d0457d ffffea0007421dc0 ffff8801d0877d04 0000000000000000 ffff8801d0877d04 ffffffff856b29c0 ffff8801d0877790 ffffffff814fbb23 ffff8801d0877d04 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x124 lib/dump_stack.c:51 [] print_address_description+0x73/0x260 mm/kasan/report.c:252 [] kasan_report_error mm/kasan/report.c:351 [inline] [] kasan_report+0x285/0x370 mm/kasan/report.c:408 [] __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:426 [] strnlen+0xc1/0xd0 lib/string.c:498 [] string.isra.4+0x4c/0x240 lib/vsprintf.c:518 [] vsnprintf+0x766/0x15f0 lib/vsprintf.c:1907 [] vscnprintf+0x2d/0x60 lib/vsprintf.c:2010 [] vprintk_emit+0xdb/0x850 kernel/printk/printk.c:1729 [] vprintk+0x28/0x30 kernel/printk/printk.c:1843 [] vprintk_default+0x1d/0x30 kernel/printk/printk.c:1844 [] printk+0xb7/0xe2 kernel/printk/printk.c:1922 [] do_ip_vs_set_ctl+0x9b7/0xba0 net/netfilter/ipvs/ip_vs_ctl.c:2398 [] nf_sockopt net/netfilter/nf_sockopt.c:105 [inline] [] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:114 [] ip_setsockopt+0xa1/0xb0 net/ipv4/ip_sockglue.c:1226 [] udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2154 [] sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2659 [] SYSC_setsockopt net/socket.c:1767 [inline] [] SyS_setsockopt+0x160/0x250 net/socket.c:1746 [] entry_SYSCALL_64_fastpath+0x16/0x76 The buggy address belongs to the page: page:ffffea0007421dc0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x8000000000000000() page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d0877c00: 00 00 00 00 00 04 f2 f2 f2 f2 f2 f2 00 00 00 00 ffff8801d0877c80: 00 00 00 00 f2 f2 f2 f2 00 00 00 00 00 00 00 00 >ffff8801d0877d00: 04 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8801d0877d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801d0877e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================