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BUG: KMSAN: uninit-value in pskb_may_pull include/linux/skbuff.h:2112 [inline]
BUG: KMSAN: uninit-value in ipv6_gso_pull_exthdrs net/ipv6/ip6_offload.c:47 [inline]
BUG: KMSAN: uninit-value in ipv6_gso_segment+0xa72/0x1d90 net/ipv6/ip6_offload.c:87
CPU: 1 PID: 15686 Comm: syz-executor0 Not tainted 4.17.0+ #22
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+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:990
 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:640
 pskb_may_pull include/linux/skbuff.h:2112 [inline]
 ipv6_gso_pull_exthdrs net/ipv6/ip6_offload.c:47 [inline]
 ipv6_gso_segment+0xa72/0x1d90 net/ipv6/ip6_offload.c:87
 skb_mac_gso_segment+0x420/0x7b0 net/core/dev.c:2793
 nsh_gso_segment+0x658/0x1340 net/nsh/nsh.c:111
 skb_mac_gso_segment+0x420/0x7b0 net/core/dev.c:2793
 __skb_gso_segment+0x757/0xa40 net/core/dev.c:2866
 skb_gso_segment include/linux/netdevice.h:4038 [inline]
 validate_xmit_skb+0xc30/0x1320 net/core/dev.c:3119
 __dev_queue_xmit+0x2370/0x3540 net/core/dev.c:3576
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3617
 packet_snd net/packet/af_packet.c:2953 [inline]
 packet_sendmsg+0x818b/0x8cc0 net/packet/af_packet.c:2978
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg net/socket.c:639 [inline]
 __sys_sendto+0x6c4/0x7e0 net/socket.c:1789
 __do_sys_sendto net/socket.c:1801 [inline]
 __se_sys_sendto net/socket.c:1797 [inline]
 __x64_sys_sendto+0x1a1/0x210 net/socket.c:1797
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455e29
RSP: 002b:00007f4d0102fc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f4d010306d4 RCX: 0000000000455e29
RDX: 0000000000000012 RSI: 0000000020000000 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 00000000200000c0 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c14fe R14: 00000000004d1a20 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:181
 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan_hooks.c:91
 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan_hooks.c:100
 slab_post_alloc_hook mm/slab.h:446 [inline]
 slab_alloc_node mm/slub.c:2753 [inline]
 slab_alloc mm/slub.c:2761 [inline]
 __kmalloc_track_caller+0x953/0xc80 mm/slub.c:4365
 kmemdup+0x95/0x140 mm/util.c:118
 __devinet_sysctl_register+0xd8/0x750 net/ipv4/devinet.c:2297
 devinet_sysctl_register+0x2f2/0x3a0 net/ipv4/devinet.c:2349
 inetdev_init+0x546/0xa60 net/ipv4/devinet.c:263
 inetdev_event+0xf14/0x1db0 net/ipv4/devinet.c:1456
 notifier_call_chain kernel/notifier.c:93 [inline]
 __raw_notifier_call_chain kernel/notifier.c:394 [inline]
 raw_notifier_call_chain+0x13e/0x240 kernel/notifier.c:401
 call_netdevice_notifiers_info net/core/dev.c:1734 [inline]
 call_netdevice_notifiers net/core/dev.c:1752 [inline]
 register_netdevice+0x2178/0x2720 net/core/dev.c:7990
 veth_newlink+0x1186/0x1480 drivers/net/veth.c:443
 rtnl_newlink+0x2721/0x37a0 net/core/rtnetlink.c:3034
 rtnetlink_rcv_msg+0xa44/0x1570 net/core/rtnetlink.c:4646
 netlink_rcv_skb+0x37e/0x600 net/netlink/af_netlink.c:2448
 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:4664
 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
 netlink_unicast+0x1680/0x1750 net/netlink/af_netlink.c:1336
 netlink_sendmsg+0x104f/0x1350 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg net/socket.c:639 [inline]
 ___sys_sendmsg+0xec8/0x1320 net/socket.c:2117
 __sys_sendmsg net/socket.c:2155 [inline]
 __do_sys_sendmsg net/socket.c:2164 [inline]
 __se_sys_sendmsg net/socket.c:2162 [inline]
 __x64_sys_sendmsg+0x331/0x460 net/socket.c:2162
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
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