binder: 6266:6285 ioctl c0306201 204edfd0 returned -22 IPVS: set_ctl: invalid protocol: 0 224.0.0.1:0 lc sg_write: data in/out 2012/78 bytes for SCSI command 0x0-- guessing data in; program syz-executor0 not setting count and/or reply_len properly ================================================================== BUG: KASAN: stack-out-of-bounds in strnlen+0xc1/0xd0 lib/string.c:498 Read of size 1 at addr ffff8800a0767cf4 by task syz-executor4/6309 CPU: 1 PID: 6309 Comm: syz-executor4 Not tainted 4.4.135-ge75204c #55 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 3f3eb52ea9934407 ffff8800a0767760 ffffffff81e0ed0d ffffea000281d9c0 ffff8800a0767cf4 0000000000000000 ffff8800a0767cf4 ffff8800a0767cc0 ffff8800a0767798 ffffffff81515946 ffff8800a0767cf4 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x124 lib/dump_stack.c:51 [] print_address_description+0x6c/0x216 mm/kasan/report.c:252 [] kasan_report_error mm/kasan/report.c:351 [inline] [] kasan_report.cold.7+0x175/0x2f7 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/0x250 lib/vsprintf.c:518 [] vsnprintf+0x402/0x18e0 lib/vsprintf.c:1907 [] vscnprintf+0x2d/0x60 lib/vsprintf.c:2010 [] vprintk_emit+0xdf/0x840 kernel/printk/printk.c:1729 [] vprintk+0x28/0x30 kernel/printk/printk.c:1843 [] vprintk_default+0x1d/0x30 kernel/printk/printk.c:1844 [] printk+0xaf/0xd7 kernel/printk/printk.c:1922 [] do_ip_vs_set_ctl.cold.37+0x32/0x37 net/netfilter/ipvs/ip_vs_ctl.c:2394 [] nf_sockopt net/netfilter/nf_sockopt.c:105 [inline] [] nf_setsockopt+0x6d/0xc0 net/netfilter/nf_sockopt.c:114 [] ip_setsockopt+0x9a/0xb0 net/ipv4/ip_sockglue.c:1227 [] tcp_setsockopt+0x88/0xe0 net/ipv4/tcp.c:2643 [] sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:2659 [] SYSC_setsockopt net/socket.c:1767 [inline] [] SyS_setsockopt+0x166/0x260 net/socket.c:1746 [] entry_SYSCALL_64_fastpath+0x22/0x9e The buggy address belongs to the page: page:ffffea000281d9c0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x4000000000000000() page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8800a0767b80: f2 f2 00 00 00 00 00 f2 f2 f2 f2 f2 f2 f2 00 00 ffff8800a0767c00: 00 00 00 04 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 >ffff8800a0767c80: 00 00 f2 f2 f2 f2 00 00 00 00 00 00 00 00 04 f2 ^ ffff8800a0767d00: f2 f2 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8800a0767d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================