Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 10573 Comm: syz.0.1373 Not tainted 6.14.0-syzkaller-05884-g2ea396448f26 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:tipc_udp_nl_dump_remoteip+0x5be/0x9c0 net/tipc/udp_media.c:-1 Code: 7c 24 38 49 8d 86 d0 00 00 00 48 89 44 24 50 49 8d 86 c8 00 00 00 48 89 44 24 40 45 31 ff 48 89 5c 24 78 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 83 db 6a f6 4d 8b 34 24 44 89 ff RSP: 0018:ffffc9000c6b7040 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88805ef06098 RCX: 0000000000080000 RDX: ffffc90004c12000 RSI: 00000000000001ed RDI: 00000000000001ee RBP: ffffc9000c6b7190 R08: ffffffff89e5dea6 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff888024e093c0 R15: 0000000000000000 FS: 00007f2ba17256c0(0000) GS:ffff8881250ea000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2dbea7 CR3: 00000000310be000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: genl_dumpit+0x10d/0x1b0 net/netlink/genetlink.c:1027 netlink_dump+0x678/0xeb0 net/netlink/af_netlink.c:2309 __netlink_dump_start+0x5a2/0x790 net/netlink/af_netlink.c:2424 genl_family_rcv_msg_dumpit net/netlink/genetlink.c:1076 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1192 [inline] genl_rcv_msg+0x8a4/0xf00 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x208/0x480 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+0x7f8/0x9a0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8c3/0xcd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:727 ____sys_sendmsg+0x523/0x860 net/socket.c:2566 ___sys_sendmsg net/socket.c:2620 [inline] __sys_sendmsg+0x271/0x360 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2ba098d169 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:00007f2ba1725038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f2ba0ba5fa0 RCX: 00007f2ba098d169 RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000000000000003 RBP: 00007f2ba0a0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2ba0ba5fa0 R15: 00007fff5b207d88 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:tipc_udp_nl_dump_remoteip+0x5be/0x9c0 net/tipc/udp_media.c:-1 Code: 7c 24 38 49 8d 86 d0 00 00 00 48 89 44 24 50 49 8d 86 c8 00 00 00 48 89 44 24 40 45 31 ff 48 89 5c 24 78 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 83 db 6a f6 4d 8b 34 24 44 89 ff RSP: 0018:ffffc9000c6b7040 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88805ef06098 RCX: 0000000000080000 RDX: ffffc90004c12000 RSI: 00000000000001ed RDI: 00000000000001ee RBP: ffffc9000c6b7190 R08: ffffffff89e5dea6 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff888024e093c0 R15: 0000000000000000 FS: 00007f2ba17256c0(0000) GS:ffff888124fea000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2ba1704d58 CR3: 00000000310be000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 7c 24 jl 0x26 2: 38 49 8d cmp %cl,-0x73(%rcx) 5: 86 d0 xchg %dl,%al 7: 00 00 add %al,(%rax) 9: 00 48 89 add %cl,-0x77(%rax) c: 44 24 50 rex.R and $0x50,%al f: 49 8d 86 c8 00 00 00 lea 0xc8(%r14),%rax 16: 48 89 44 24 40 mov %rax,0x40(%rsp) 1b: 45 31 ff xor %r15d,%r15d 1e: 48 89 5c 24 78 mov %rbx,0x78(%rsp) 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 e7 mov %r12,%rdi 34: e8 83 db 6a f6 call 0xf66adbbc 39: 4d 8b 34 24 mov (%r12),%r14 3d: 44 89 ff mov %r15d,%edi