netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'.
=====================================================
BUG: KMSAN: uninit-value in nla_ok include/net/netlink.h:1146 [inline]
BUG: KMSAN: uninit-value in __nla_validate_parse+0x642/0x46e0 lib/nlattr.c:521
CPU: 0 PID: 9225 Comm: syz-executor.1 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x21c/0x280 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 nla_ok include/net/netlink.h:1146 [inline]
 __nla_validate_parse+0x642/0x46e0 lib/nlattr.c:521
 __nla_parse+0x141/0x150 lib/nlattr.c:630
 nla_parse_nested include/net/netlink.h:1199 [inline]
 fl_set_erspan_opt+0x37a/0xdf0 net/sched/cls_flower.c:1198
 fl_set_enc_opt net/sched/cls_flower.c:1356 [inline]
 fl_set_key+0x7e8c/0xb590 net/sched/cls_flower.c:1629
 fl_set_parms net/sched/cls_flower.c:1865 [inline]
 fl_change+0x13b9/0x7f80 net/sched/cls_flower.c:1964
 tc_new_tfilter+0x370e/0x5940 net/sched/cls_api.c:2127
 rtnetlink_rcv_msg+0xea0/0x18c0 net/core/rtnetlink.c:5451
 netlink_rcv_skb+0x6d7/0x7e0 net/netlink/af_netlink.c:2469
 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:5478
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x11c8/0x1490 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x173a/0x1840 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0xc82/0x1240 net/socket.c:2352
 ___sys_sendmsg net/socket.c:2406 [inline]
 __sys_sendmmsg+0x808/0xf70 net/socket.c:2489
 __compat_sys_sendmmsg net/compat.c:480 [inline]
 __do_compat_sys_sendmmsg net/compat.c:487 [inline]
 __se_compat_sys_sendmmsg+0xcd/0xf0 net/compat.c:484
 __ia32_compat_sys_sendmmsg+0x56/0x70 net/compat.c:484
 do_syscall_32_irqs_on arch/x86/entry/common.c:430 [inline]
 __do_fast_syscall_32+0x2af/0x480 arch/x86/entry/common.c:477
 do_fast_syscall_32+0x6b/0xd0 arch/x86/entry/common.c:505
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:554
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f4a549
Code: Bad RIP value.
RSP: 002b:00000000f55230cc EFLAGS: 00000296 ORIG_RAX: 0000000000000159
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000200
RDX: 00000000675dec16 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:127
 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:80
 slab_alloc_node mm/slub.c:2839 [inline]
 __kmalloc_node_track_caller+0xeab/0x12e0 mm/slub.c:4478
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x35f/0xb30 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1083 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1175 [inline]
 netlink_sendmsg+0xdb9/0x1840 net/netlink/af_netlink.c:1893
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0xc82/0x1240 net/socket.c:2352
 ___sys_sendmsg net/socket.c:2406 [inline]
 __sys_sendmmsg+0x808/0xf70 net/socket.c:2489
 __compat_sys_sendmmsg net/compat.c:480 [inline]
 __do_compat_sys_sendmmsg net/compat.c:487 [inline]
 __se_compat_sys_sendmmsg+0xcd/0xf0 net/compat.c:484
 __ia32_compat_sys_sendmmsg+0x56/0x70 net/compat.c:484
 do_syscall_32_irqs_on arch/x86/entry/common.c:430 [inline]
 __do_fast_syscall_32+0x2af/0x480 arch/x86/entry/common.c:477
 do_fast_syscall_32+0x6b/0xd0 arch/x86/entry/common.c:505
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:554
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
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