syzbot

netlink: 12 bytes leftover after parsing attributes in process `syz.3.618'.
Unable to handle kernel paging request at virtual address dfff800000000068
KASAN: null-ptr-deref in range [0x0000000000000340-0x0000000000000347]
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff800000000068] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 7192 Comm: syz.3.618 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : __in6_dev_get include/net/addrconf.h:323 [inline]
pc : ip6_ignore_linkdown include/net/addrconf.h:414 [inline]
pc : find_match+0xa0/0xb0c net/ipv6/route.c:784
lr : find_match+0x74/0xb0c net/ipv6/route.c:781
sp : ffff8000210a6500
x29: ffff8000210a6520 x28: 1fffe0001b74bf04 x27: dfff800000000000
x26: 0000000000000340 x25: ffff0000dba5f837 x24: 0000000000000201
x23: 0000000000000003 x22: ffff0000dba5f820 x21: 0000000000000001
x20: 1fffe0001b74bf06 x19: 0000000000000000 x18: 0000000000000000
x17: 00000000ffff0000 x16: ffff8000082d0e30 x15: 0000000000000002
x14: 00000000ffffffff x13: 0000000000ff0100 x12: 0000000000ff0100
x11: ff008000107b78e4 x10: 0000000000000002 x9 : ffff0000f3940000
x8 : 0000000000000068 x7 : ffff8000210a68b0 x6 : 0000000000000003
x5 : ffff8000210a68b0 x4 : ffff8000210a68a0 x3 : 0000000000000003
x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 __in6_dev_get include/net/addrconf.h:323 [inline]
 ip6_ignore_linkdown include/net/addrconf.h:414 [inline]
 find_match+0xa0/0xb0c net/ipv6/route.c:784
 rt6_nh_find_match+0xcc/0x138 net/ipv6/route.c:824
 nexthop_for_each_fib6_nh+0x1a8/0x3d0 net/ipv4/nexthop.c:1243
 __find_rr_leaf+0x3b8/0x5c8 net/ipv6/route.c:865
 find_rr_leaf net/ipv6/route.c:902 [inline]
 rt6_select net/ipv6/route.c:937 [inline]
 fib6_table_lookup+0x45c/0x8b8 net/ipv6/route.c:2223
 ip6_pol_route+0x1f4/0x1024 net/ipv6/route.c:2259
 ip6_pol_route_output+0x60/0x94 net/ipv6/route.c:2634
 pol_lookup_func include/net/ip6_fib.h:579 [inline]
 fib6_rule_lookup+0x258/0x4a8 net/ipv6/fib6_rules.c:121
 ip6_route_output_flags_noref+0x250/0x314 net/ipv6/route.c:2666
 ip6_route_output_flags+0xe4/0x368 net/ipv6/route.c:2679
 ip6_dst_lookup_tail+0x274/0x12c0 net/ipv6/ip6_output.c:1152
 ip6_dst_lookup_flow+0x54/0xe0 net/ipv6/ip6_output.c:1255
 tipc_udp_xmit+0x28c/0x93c net/tipc/udp_media.c:210
 tipc_udp_send_msg+0x254/0x380 net/tipc/udp_media.c:258
 tipc_bearer_xmit_skb+0x244/0x384 net/tipc/bearer.c:577
 tipc_enable_bearer net/tipc/bearer.c:368 [inline]
 __tipc_nl_bearer_enable+0xd7c/0x10bc net/tipc/bearer.c:1049
 tipc_nl_bearer_enable+0x2c/0x48 net/tipc/bearer.c:1058
 genl_family_rcv_msg_doit+0x1f8/0x2f4 net/netlink/genetlink.c:756
 genl_family_rcv_msg net/netlink/genetlink.c:833 [inline]
 genl_rcv_msg+0x444/0x62c net/netlink/genetlink.c:850
 netlink_rcv_skb+0x208/0x3c4 net/netlink/af_netlink.c:2511
 genl_rcv+0x38/0x50 net/netlink/genetlink.c:861
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x60c/0x824 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x6e8/0x9b0 net/netlink/af_netlink.c:1872
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5b8/0x918 net/socket.c:2519
 ___sys_sendmsg net/socket.c:2573 [inline]
 __sys_sendmsg+0x25c/0x320 net/socket.c:2602
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg net/socket.c:2609 [inline]
 __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2609
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: 96047ccc f94002c8 910d011a d343ff48 (387b6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	96047ccc 	bl	0xfffffffff811f330
   4:	f94002c8 	ldr	x8, [x22]
   8:	910d011a 	add	x26, x8, #0x340
   c:	d343ff48 	lsr	x8, x26, #3
* 10:	387b6908 	ldrb	w8, [x8, x27] <-- trapping instruction