Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 20803 Comm: syz.0.4211 Not tainted 6.15.0-rc3-syzkaller-00109-gf73f05c6f711 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:tipc_udp_nl_dump_remoteip+0x58c/0x9d0 net/tipc/udp_media.c:516 Code: 89 44 24 68 48 c1 e8 03 48 89 44 24 60 48 89 4c 24 40 48 c1 e9 03 48 89 4c 24 58 48 89 5c 24 28 4d 89 f7 4c 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ef e8 a5 43 28 f7 49 8b 45 00 48 89 84 RSP: 0018:ffffc90003327000 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888060dcc5f0 RCX: 1ffff1100b393981 RDX: 1ffff1100c1b98be RSI: 0000000000000199 RDI: 000000000000019a RBP: ffffc90003327170 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8aef19b5 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff888059c9cb40 R15: ffff888059c9cb40 FS: 00007f56d1ba06c0(0000) GS:ffff8881260cf000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2878b7 CR3: 0000000036e8e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: genl_dumpit+0x108/0x1b0 net/netlink/genetlink.c:1027 netlink_dump+0x64e/0xe70 net/netlink/af_netlink.c:2309 __netlink_dump_start+0x5cb/0x7e0 net/netlink/af_netlink.c:2424 genl_family_rcv_msg_dumpit+0x1e7/0x2c0 net/netlink/genetlink.c:1076 genl_family_rcv_msg net/netlink/genetlink.c:1192 [inline] genl_rcv_msg+0x5da/0x790 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x219/0x490 net/netlink/af_netlink.c:2534 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x758/0x8d0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:727 ____sys_sendmsg+0x505/0x830 net/socket.c:2566 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f56d0d8e969 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:00007f56d1ba0038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f56d0fb6160 RCX: 00007f56d0d8e969 RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000000000000006 RBP: 00007f56d0e10ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f56d0fb6160 R15: 00007fff7a9565f8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:tipc_udp_nl_dump_remoteip+0x58c/0x9d0 net/tipc/udp_media.c:516 Code: 89 44 24 68 48 c1 e8 03 48 89 44 24 60 48 89 4c 24 40 48 c1 e9 03 48 89 4c 24 58 48 89 5c 24 28 4d 89 f7 4c 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ef e8 a5 43 28 f7 49 8b 45 00 48 89 84 RSP: 0018:ffffc90003327000 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888060dcc5f0 RCX: 1ffff1100b393981 RDX: 1ffff1100c1b98be RSI: 0000000000000199 RDI: 000000000000019a RBP: ffffc90003327170 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8aef19b5 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff888059c9cb40 R15: ffff888059c9cb40 FS: 00007f56d1ba06c0(0000) GS:ffff8881261cf000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000017c0 CR3: 0000000036e8e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 44 24 68 mov %eax,0x68(%rsp) 4: 48 c1 e8 03 shr $0x3,%rax 8: 48 89 44 24 60 mov %rax,0x60(%rsp) d: 48 89 4c 24 40 mov %rcx,0x40(%rsp) 12: 48 c1 e9 03 shr $0x3,%rcx 16: 48 89 4c 24 58 mov %rcx,0x58(%rsp) 1b: 48 89 5c 24 28 mov %rbx,0x28(%rsp) 20: 4d 89 f7 mov %r14,%r15 23: 4c 89 e8 mov %r13,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ef mov %r13,%rdi 34: e8 a5 43 28 f7 call 0xf72843de 39: 49 8b 45 00 mov 0x0(%r13),%rax 3d: 48 rex.W 3e: 89 .byte 0x89 3f: 84 .byte 0x84