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TITLE: KMSAN: use of uninitialized memory in packet_set_ring
[ 208.131930] ==================================================================
[ 208.139343] BUG: KMSAN: use of uninitialized memory in packet_set_ring+0x11b8/0x2ff0
[ 208.147224] CPU: 0 PID: 12442 Comm: syz-executor0 Tainted: G B 4.13.0+ #12
[ 208.155359] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 208.164705] Call Trace:
[ 208.167295] dump_stack+0x172/0x1c0
[ 208.170931] ? packet_set_ring+0x11b8/0x2ff0
[ 208.175334] kmsan_report+0x145/0x3d0
[ 208.179143] __msan_warning_32+0x65/0xb0
[ 208.183202] packet_set_ring+0x11b8/0x2ff0
[ 208.187429] ? memcmp+0xbc/0x1a0
[ 208.190799] packet_setsockopt+0x1619/0x4e40
[ 208.195205] ? selinux_socket_setsockopt+0x2f1/0x330
[ 208.200305] ? __msan_load_shadow_origin_8+0x5d/0xe0
[ 208.205390] ? packet_ioctl+0x400/0x400
[ 208.209340] SYSC_setsockopt+0x36d/0x4b0
[ 208.213383] SyS_setsockopt+0x76/0xa0
[ 208.217163] entry_SYSCALL_64_fastpath+0x13/0x94
[ 208.221889] RIP: 0033:0x4520a9
[ 208.225056] RSP: 002b:00007f37efa32c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000036
[ 208.232740] RAX: ffffffffffffffda RBX: 00007f37efa33700 RCX: 00000000004520a9
[ 208.239987] RDX: 0000000000000005 RSI: 0000000000000107 RDI: 000000000000001e
[ 208.247230] RBP: 0000000000a6f870 R08: 000000000000047e R09: 0000000000000000
[ 208.254485] R10: 0000000020001000 R11: 0000000000000216 R12: 0000000000000000
[ 208.261729] R13: 0000000000a6f7ef R14: 00007f37efa339c0 R15: 000000000000000c
[ 208.268977] origin description: ----req_u@packet_setsockopt
[ 208.274656] local variable created at:
[ 208.278520] packet_setsockopt+0x133/0x4e40
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