lec:lec_vcc_attach: copy from user failed for 28 bytes 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: 20207 Comm: syz.2.3520 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:lec_arp_clear_vccs+0xad/0x380 net/atm/lec.c:1263 Code: e8 03 80 3c 28 00 74 08 4c 89 e7 e8 0d e5 ab f7 4c 89 74 24 18 49 8b 2c 24 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 e5 e4 ab f7 4d 8b 75 00 4d 8d a7 30 RSP: 0018:ffffc9000c547c08 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff888054073000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff8bbfc640 RDI: ffff888054073000 RBP: ffff88804f512000 R08: ffffffff8e6958b3 R09: 1ffffffff1cd2b16 R10: dffffc0000000000 R11: fffffbfff1cd2b17 R12: ffff88807a8ff650 R13: 0000000000000000 R14: ffff888054073030 R15: ffff88807a8ff000 FS: 00007f77f24386c0(0000) GS:ffff8881260b1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4cf11750e0 CR3: 0000000079422000 CR4: 00000000003526f0 Call Trace: lec_vcc_close net/atm/lec.c:2183 [inline] lec_push+0x3cb/0x1860 net/atm/lec.c:594 vcc_destroy_socket net/atm/common.c:183 [inline] vcc_release+0x15f/0x580 net/atm/common.c:205 __sock_release net/socket.c:653 [inline] sock_close+0xc3/0x240 net/socket.c:1446 __fput+0x44c/0xa70 fs/file_table.c:468 fput_close_sync+0x113/0x220 fs/file_table.c:573 __do_sys_close fs/open.c:1573 [inline] __se_sys_close fs/open.c:1558 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1558 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f77f158f749 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:00007f77f2438038 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 00007f77f17e5fa0 RCX: 00007f77f158f749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f77f1613f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f77f17e6038 R14: 00007f77f17e5fa0 R15: 00007ffdf8576ad8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:lec_arp_clear_vccs+0xad/0x380 net/atm/lec.c:1263 Code: e8 03 80 3c 28 00 74 08 4c 89 e7 e8 0d e5 ab f7 4c 89 74 24 18 49 8b 2c 24 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 e5 e4 ab f7 4d 8b 75 00 4d 8d a7 30 RSP: 0018:ffffc9000c547c08 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff888054073000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff8bbfc640 RDI: ffff888054073000 RBP: ffff88804f512000 R08: ffffffff8e6958b3 R09: 1ffffffff1cd2b16 R10: dffffc0000000000 R11: fffffbfff1cd2b17 R12: ffff88807a8ff650 R13: 0000000000000000 R14: ffff888054073030 R15: ffff88807a8ff000 FS: 00007f77f24386c0(0000) GS:ffff8881260b1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4cf11750e0 CR3: 0000000079422000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: e8 03 80 3c 28 call 0x283c8008 5: 00 74 08 4c add %dh,0x4c(%rax,%rcx,1) 9: 89 e7 mov %esp,%edi b: e8 0d e5 ab f7 call 0xf7abe51d 10: 4c 89 74 24 18 mov %r14,0x18(%rsp) 15: 49 8b 2c 24 mov (%r12),%rbp 19: 4c 89 e8 mov %r13,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ef mov %r13,%rdi 33: e8 e5 e4 ab f7 call 0xf7abe51d 38: 4d 8b 75 00 mov 0x0(%r13),%r14 3c: 4d rex.WRB 3d: 8d .byte 0x8d 3e: a7 cmpsl %es:(%rdi),%ds:(%rsi) 3f: 30 .byte 0x30