===================================================== BUG: KMSAN: uninit-value in decode_session6 net/xfrm/xfrm_policy.c:3407 [inline] BUG: KMSAN: uninit-value in __xfrm_decode_session+0x12ea/0x3450 net/xfrm/xfrm_policy.c:3482 CPU: 1 PID: 18543 Comm: syz-executor.0 Not tainted 5.5.0-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+0x1c9/0x220 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 decode_session6 net/xfrm/xfrm_policy.c:3407 [inline] __xfrm_decode_session+0x12ea/0x3450 net/xfrm/xfrm_policy.c:3482 xfrm_decode_session_reverse include/net/xfrm.h:1144 [inline] icmpv6_route_lookup net/ipv6/icmp.c:369 [inline] icmp6_send+0x3280/0x36d0 net/ipv6/icmp.c:569 icmpv6_send+0xe4/0x110 net/ipv6/ip6_icmp.c:43 ip6_link_failure+0x68/0x590 net/ipv6/route.c:2643 dst_link_failure include/net/dst.h:419 [inline] ip6_tnl_xmit+0x20c6/0x4240 net/ipv6/ip6_tunnel.c:1222 ip6ip6_tnl_xmit net/ipv6/ip6_tunnel.c:1376 [inline] ip6_tnl_start_xmit+0x233e/0x2590 net/ipv6/ip6_tunnel.c:1402 __netdev_start_xmit include/linux/netdevice.h:4447 [inline] netdev_start_xmit include/linux/netdevice.h:4461 [inline] xmit_one net/core/dev.c:3420 [inline] dev_hard_start_xmit+0x531/0xab0 net/core/dev.c:3436 sch_direct_xmit+0x512/0x18b0 net/sched/sch_generic.c:314 qdisc_restart net/sched/sch_generic.c:377 [inline] __qdisc_run+0x15ec/0x3350 net/sched/sch_generic.c:385 __dev_xmit_skb net/core/dev.c:3677 [inline] __dev_queue_xmit+0x226a/0x4220 net/core/dev.c:3982 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4046 neigh_direct_output+0x42/0x50 net/core/neighbour.c:1527 neigh_output include/net/neighbour.h:510 [inline] ip6_finish_output2+0x20fd/0x2640 net/ipv6/ip6_output.c:116 ip6_fragment+0x24a9/0x3950 net/ipv6/ip6_output.c:860 __ip6_finish_output+0x73a/0x8e0 net/ipv6/ip6_output.c:140 ip6_finish_output+0x166/0x410 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x60a/0x770 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] ip6_local_out+0x164/0x1d0 net/ipv6/output_core.c:179 ip6_send_skb net/ipv6/ip6_output.c:1795 [inline] ip6_push_pending_frames+0x213/0x4f0 net/ipv6/ip6_output.c:1815 rawv6_push_pending_frames net/ipv6/raw.c:613 [inline] rawv6_sendmsg+0x4233/0x5c30 net/ipv6/raw.c:956 inet_sendmsg+0x2d8/0x2e0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:639 [inline] sock_sendmsg net/socket.c:659 [inline] __sys_sendto+0xaba/0xc50 net/socket.c:1985 __do_sys_sendto net/socket.c:1997 [inline] __se_sys_sendto+0x107/0x130 net/socket.c:1993 __x64_sys_sendto+0x6e/0x90 net/socket.c:1993 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45af49 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff734b5cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045af49 RDX: 000000000000ff77 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000004d97 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff734b5d6d4 R13: 00000000004cab1e R14: 00000000004e40e8 R15: 00000000ffffffff 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:82 slab_alloc_node mm/slub.c:2774 [inline] slab_alloc mm/slub.c:2783 [inline] __kmalloc_track_caller+0x8ce/0xef0 mm/slub.c:4352 kmemdup+0x95/0x140 mm/util.c:127 __devinet_sysctl_register+0xe4/0x770 net/ipv4/devinet.c:2557 devinet_sysctl_register+0x2ef/0x3a0 net/ipv4/devinet.c:2609 inetdev_init+0x3d9/0xa50 net/ipv4/devinet.c:276 inetdev_event+0x3dd/0x1e80 net/ipv4/devinet.c:1525 notifier_call_chain kernel/notifier.c:83 [inline] __raw_notifier_call_chain kernel/notifier.c:361 [inline] raw_notifier_call_chain+0x12a/0x240 kernel/notifier.c:368 call_netdevice_notifiers_info net/core/dev.c:1893 [inline] call_netdevice_notifiers_extack net/core/dev.c:1905 [inline] call_netdevice_notifiers net/core/dev.c:1919 [inline] register_netdevice+0x2b8a/0x3170 net/core/dev.c:9345 br_dev_newlink+0x92/0x2c0 net/bridge/br_netlink.c:1315 __rtnl_newlink net/core/rtnetlink.c:3305 [inline] rtnl_newlink+0x2973/0x3920 net/core/rtnetlink.c:3363 rtnetlink_rcv_msg+0x1153/0x1570 net/core/rtnetlink.c:5424 netlink_rcv_skb+0x451/0x650 net/netlink/af_netlink.c:2477 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:5442 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0xf9e/0x1100 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x1248/0x14d0 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:639 [inline] sock_sendmsg net/socket.c:659 [inline] ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2330 ___sys_sendmsg net/socket.c:2384 [inline] __sys_sendmsg+0x451/0x5f0 net/socket.c:2417 __do_sys_sendmsg net/socket.c:2426 [inline] __se_sys_sendmsg+0x97/0xb0 net/socket.c:2424 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2424 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x44/0xa9 =====================================================