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BUG: KMSAN: uninit-value in strnlen+0xc4/0x110 lib/string.c:499
CPU: 1 PID: 4507 Comm: syzkaller579712 Not tainted 4.16.0+ #85
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+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
 strnlen+0xc4/0x110 lib/string.c:499
 dev_name_hash net/core/dev.c:209 [inline]
 dev_get_by_name_rcu net/core/dev.c:764 [inline]
 dev_get_by_name+0x6e/0x350 net/core/dev.c:791
 pppoe_connect+0xcb7/0x2360 drivers/net/ppp/pppoe.c:665
 SYSC_connect+0x41a/0x510 net/socket.c:1639
 SyS_connect+0x54/0x80 net/socket.c:1620
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x43fcf9
RSP: 002b:00007ffca4bd4978 EFLAGS: 00000213 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcf9
RDX: 0000000000000007 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000213 R12: 0000000000401620
R13: 00000000004016b0 R14: 0000000000000000 R15: 0000000000000000

Local variable description: ----address@SYSC_connect
Variable was created at:
 SYSC_connect+0x6f/0x510 net/socket.c:1622
 SyS_connect+0x54/0x80 net/socket.c:1620
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