netlink: 12 bytes leftover after parsing attributes in process `syz.0.414'. tipc: Started in network mode tipc: Node identity 00000000000000000000000000000001, cluster identity 4711 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000018: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7] CPU: 1 UID: 0 PID: 7515 Comm: syz.0.414 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:__in6_dev_get include/net/addrconf.h:347 [inline] RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:443 [inline] RIP: 0010:find_match+0xa3/0xc90 net/ipv6/route.c:780 Code: 00 00 00 00 00 fc ff df 42 80 7c 25 00 00 74 08 48 89 df e8 2f 32 f1 f7 48 89 d8 bb c0 00 00 00 48 03 18 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 0e 32 f1 f7 48 8b 1b e8 e6 65 48 RSP: 0018:ffffc90004b26690 EFLAGS: 00010216 RAX: 0000000000000018 RBX: 00000000000000c0 RCX: 0000000000000002 RDX: ffff88807e4d9e00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 1ffff11009e314a4 R08: ffffc90004b26a20 R09: ffffc90004b26a30 R10: dffffc0000000000 R11: ffffffff8a31f6e0 R12: dffffc0000000000 R13: 0000000000000003 R14: 1ffff11009e314a6 R15: ffff88804f18a537 FS: 00007f02291e46c0(0000) GS:ffff888125d13000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f66abdd7d58 CR3: 0000000077444000 CR4: 0000000000350ef0 Call Trace: rt6_nh_find_match+0xd9/0x150 net/ipv6/route.c:820 nexthop_for_each_fib6_nh+0x1d0/0x400 net/ipv4/nexthop.c:1515 __find_rr_leaf+0x461/0x6d0 net/ipv6/route.c:861 find_rr_leaf net/ipv6/route.c:889 [inline] rt6_select net/ipv6/route.c:933 [inline] fib6_table_lookup+0x39f/0xa80 net/ipv6/route.c:2233 ip6_pol_route+0x222/0x1180 net/ipv6/route.c:2269 pol_lookup_func include/net/ip6_fib.h:617 [inline] fib6_rule_lookup+0x348/0x6f0 net/ipv6/fib6_rules.c:125 ip6_route_output_flags_noref net/ipv6/route.c:2684 [inline] ip6_route_output_flags+0x364/0x5d0 net/ipv6/route.c:2696 ip6_dst_lookup_tail+0x299/0x1510 net/ipv6/ip6_output.c:1159 ip6_dst_lookup_flow+0x47/0xe0 net/ipv6/ip6_output.c:1262 tipc_udp_xmit+0x312/0xaa0 net/tipc/udp_media.c:210 tipc_bearer_xmit_skb+0x2b3/0x400 net/tipc/bearer.c:575 tipc_enable_bearer net/tipc/bearer.c:366 [inline] __tipc_nl_bearer_enable+0x1044/0x13f0 net/tipc/bearer.c:1047 tipc_nl_bearer_enable+0x22/0x40 net/tipc/bearer.c:1056 genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 ____sys_sendmsg+0x505/0x830 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f022838eec9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f02291e4038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f02285e5fa0 RCX: 00007f022838eec9 RDX: 0000000000000000 RSI: 00002000000010c0 RDI: 0000000000000006 RBP: 00007f0228411f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f02285e6038 R14: 00007f02285e5fa0 R15: 00007ffcd9af8ef8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__in6_dev_get include/net/addrconf.h:347 [inline] RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:443 [inline] RIP: 0010:find_match+0xa3/0xc90 net/ipv6/route.c:780 Code: 00 00 00 00 00 fc ff df 42 80 7c 25 00 00 74 08 48 89 df e8 2f 32 f1 f7 48 89 d8 bb c0 00 00 00 48 03 18 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 0e 32 f1 f7 48 8b 1b e8 e6 65 48 RSP: 0018:ffffc90004b26690 EFLAGS: 00010216 RAX: 0000000000000018 RBX: 00000000000000c0 RCX: 0000000000000002 RDX: ffff88807e4d9e00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 1ffff11009e314a4 R08: ffffc90004b26a20 R09: ffffc90004b26a30 R10: dffffc0000000000 R11: ffffffff8a31f6e0 R12: dffffc0000000000 R13: 0000000000000003 R14: 1ffff11009e314a6 R15: ffff88804f18a537 FS: 00007f02291e46c0(0000) GS:ffff888125d13000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f66abdd7d58 CR3: 0000000077444000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess), 7 bytes skipped: 0: df 42 80 filds -0x80(%rdx) 3: 7c 25 jl 0x2a 5: 00 00 add %al,(%rax) 7: 74 08 je 0x11 9: 48 89 df mov %rbx,%rdi c: e8 2f 32 f1 f7 call 0xf7f13240 11: 48 89 d8 mov %rbx,%rax 14: bb c0 00 00 00 mov $0xc0,%ebx 19: 48 03 18 add (%rax),%rbx 1c: 48 89 d8 mov %rbx,%rax 1f: 48 c1 e8 03 shr $0x3,%rax * 23: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 28: 74 08 je 0x32 2a: 48 89 df mov %rbx,%rdi 2d: e8 0e 32 f1 f7 call 0xf7f13240 32: 48 8b 1b mov (%rbx),%rbx 35: e8 .byte 0xe8 36: e6 65 out %al,$0x65 38: 48 rex.W