kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 1650 Comm: syz-executor0 Not tainted 4.15.0-rc8+ #194 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:strlen+0x1f/0xa0 lib/string.c:479 RSP: 0018:ffff8801be5e7820 EFLAGS: 00010282 RAX: 0000000041b58ab3 RBX: ffff8801cceb9640 RCX: 000000000836b156 RDX: dffffc0000000000 RSI: ffffc900022ec000 RDI: 0000000041b58ab3 RBP: ffff8801be5e7838 R08: 1ffff10037cbce6d R09: 0000000000000005 R10: ffff8801be5e7828 R11: 0000000000000001 R12: ffff8801be5e7958 R13: 0000000041b58ab3 R14: 0000000000000040 R15: 1ffff10037cbcf0f FS: 00007f41fe623700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000006ef930 CR3: 00000001c63b2001 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: strlen include/linux/string.h:266 [inline] netlink_ack+0x120/0xa10 net/netlink/af_netlink.c:2357 netlink_rcv_skb+0x2d1/0x400 net/netlink/af_netlink.c:2448 genl_rcv+0x28/0x40 net/netlink/genetlink.c:635 netlink_unicast_kernel net/netlink/af_netlink.c:1308 [inline] netlink_unicast+0x4c4/0x6b0 net/netlink/af_netlink.c:1334 netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1897 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg+0xca/0x110 net/socket.c:640 sock_write_iter+0x31a/0x5d0 net/socket.c:909 call_write_iter include/linux/fs.h:1772 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x684/0x970 fs/read_write.c:482 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452e39 RSP: 002b:00007f41fe622c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452e39 RDX: 00000000000000d1 RSI: 0000000020772000 RDI: 0000000000000013 RBP: 00000000000003bb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3a28 R13: 00000000ffffffff R14: 00007f41fe6236d4 R15: 0000000000000000 Code: 37 ff ff ff 0f 1f 84 00 00 00 00 00 55 48 89 f9 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 48 89 f8 48 89 e5 41 54 53 48 83 ec 08 <0f> b6 14 11 48 89 f9 83 e1 07 38 ca 7f 04 84 d2 75 4b 80 38 00 RIP: strlen+0x1f/0xa0 lib/string.c:479 RSP: ffff8801be5e7820 ---[ end trace 99a3d8d2967b30fd ]---