general protection fault, probably for non-canonical address 0xdffffc0000000066: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000330-0x0000000000000337] CPU: 0 PID: 17551 Comm: systemd-udevd Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ax25_dev_ax25dev include/net/ax25.h:337 [inline] RIP: 0010:ax25_send_frame+0xe4/0x640 net/ax25/ax25_out.c:56 Code: 00 48 85 c0 49 89 c4 0f 85 fb 03 00 00 e8 24 fd 5b fa 49 8d bd 30 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 b1 04 00 00 4d 8b ad 30 03 00 00 4d 85 ed 0f 84 RSP: 0018:ffffc90000007ac0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff8880994a7808 RCX: 0000000000000002 RDX: 0000000000000066 RSI: ffffffff87181fbc RDI: 0000000000000330 RBP: ffffffff8d51eca0 R08: 0000000000000001 R09: ffffffff8c5dbb57 R10: fffffbfff18bb76a R11: 1ffffffff183c35b R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000104 R15: 0000000000000000 FS: 00007f12515468c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005575e132d094 CR3: 000000008f60c000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rose_send_frame+0xcc/0x2f0 net/rose/rose_link.c:106 rose_transmit_clear_request+0x1d5/0x290 net/rose/rose_link.c:255 rose_rx_call_request+0x4bd/0x1978 net/rose/af_rose.c:998 rose_loopback_timer+0x15d/0x470 net/rose/rose_loopback.c:100 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413 expire_timers kernel/time/timer.c:1458 [inline] __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755 __run_timers kernel/time/timer.c:1736 [inline] run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768 __do_softirq+0x2de/0xa24 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x1f3/0x230 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:__nr_to_section include/linux/mmzone.h:1210 [inline] RIP: 0010:pfn_valid include/linux/mmzone.h:1323 [inline] RIP: 0010:__virt_addr_valid+0x103/0x2b0 arch/x86/mm/physaddr.c:65 Code: 03 85 3f 00 48 c7 c0 60 fc 96 8c 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 71 01 00 00 4c 8b 25 5d 64 62 0b <4d> 85 e4 0f 84 4b 01 00 00 e8 cf 84 3f 00 48 89 d8 48 c1 e8 22 4d RSP: 0018:ffffc90016ca7d00 EFLAGS: 00000246 RAX: 1ffffffff192df8c RBX: 00000000a338f440 RCX: ffffffff813497cb RDX: dffffc0000000000 RSI: ffffffff813497dd RDI: 0000000000000007 RBP: 0000000000000014 R08: 0000000000000001 R09: ffff88804ce3ea08 R10: 000000000007ffff R11: 0000000000000000 R12: ffff88821fff0000 R13: 0000000000000001 R14: 0000000000000000 R15: ffff88808aadcb80 check_heap_object mm/usercopy.c:228 [inline] __check_object_size mm/usercopy.c:286 [inline] __check_object_size+0xc1/0x3e4 mm/usercopy.c:256 check_object_size include/linux/thread_info.h:119 [inline] check_copy_size include/linux/thread_info.h:152 [inline] copy_to_user include/linux/uaccess.h:151 [inline] readlink_copy+0x84/0xe0 fs/namei.c:4508 vfs_readlink+0x129/0x390 fs/namei.c:4549 do_readlinkat+0x27e/0x2f0 fs/stat.c:431 __do_sys_readlink fs/stat.c:452 [inline] __se_sys_readlink fs/stat.c:449 [inline] __x64_sys_readlink+0x74/0xb0 fs/stat.c:449 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f12503bb087 Code: 73 01 c3 48 8b 0d 11 be 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 59 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 bd 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffdae37a6a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000059 RAX: ffffffffffffffda RBX: 00007ffdae37b140 RCX: 00007f12503bb087 RDX: 0000000000000400 RSI: 00007ffdae37ab60 RDI: 00007ffdae37b140 RBP: 0000000000000000 R08: 00005575e1051670 R09: 000000000000000e R10: 0000000000000075 R11: 0000000000000246 R12: 00007ffdae37a760 R13: 00005575e1237500 R14: 00007ffdae37ab60 R15: 00007ffdae37b14f Modules linked in: ---[ end trace 161a18a251aa15d0 ]--- RIP: 0010:ax25_dev_ax25dev include/net/ax25.h:337 [inline] RIP: 0010:ax25_send_frame+0xe4/0x640 net/ax25/ax25_out.c:56 Code: 00 48 85 c0 49 89 c4 0f 85 fb 03 00 00 e8 24 fd 5b fa 49 8d bd 30 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 b1 04 00 00 4d 8b ad 30 03 00 00 4d 85 ed 0f 84 RSP: 0018:ffffc90000007ac0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff8880994a7808 RCX: 0000000000000002 RDX: 0000000000000066 RSI: ffffffff87181fbc RDI: 0000000000000330 RBP: ffffffff8d51eca0 R08: 0000000000000001 R09: ffffffff8c5dbb57 R10: fffffbfff18bb76a R11: 1ffffffff183c35b R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000104 R15: 0000000000000000 FS: 00007f12515468c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005575e132d094 CR3: 000000008f60c000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400