general protection fault, probably for non-canonical address 0xdffffc0000000066: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000330-0x0000000000000337] CPU: 1 PID: 2140 Comm: kworker/u4:1 Not tainted 5.9.0-rc1-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 e4 ea 57 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:ffffc90000da8ac0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff88809913c008 RCX: 0000000000000002 RDX: 0000000000000066 RSI: ffffffff871c542c RDI: 0000000000000330 RBP: ffffffff8d537220 R08: 0000000000000001 R09: ffffffff8c5f3b2f R10: fffffbfff18be765 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000104 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fae1176eda0 CR3: 000000003bc05000 CR4: 00000000001506e0 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:widen_string+0x0/0x2a0 lib/vsprintf.c:584 Code: 0f 0b e9 67 ff ff ff be 08 00 00 00 48 89 ef e8 46 27 00 fe e9 15 ff ff ff be 08 00 00 00 48 89 ef e8 34 27 00 fe eb aa 66 90 <41> 57 49 89 ff 41 56 41 89 f6 41 55 49 89 d5 41 54 55 53 48 bb 00 RSP: 0018:ffffc9001936f880 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffffffff888d2668 RCX: ffff0a00ffffff04 RDX: ffffc9001936fa71 RSI: 0000000000000007 RDI: ffffc9001936fa7c RBP: ffffc9001936fa7c R08: 0000000000000004 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000160 R12: 0000000000000000 R13: ffffc9001936fa71 R14: ffffffff888d2660 R15: 0000000000000007 string_nocheck lib/vsprintf.c:619 [inline] string+0x1fb/0x3d0 lib/vsprintf.c:693 vsnprintf+0x71b/0x14f0 lib/vsprintf.c:2617 tomoyo_supervisor+0x10c/0xeb0 security/tomoyo/common.c:2069 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline] tomoyo_execute_permission+0x375/0x470 security/tomoyo/file.c:619 tomoyo_find_next_domain+0x348/0x1f77 security/tomoyo/domain.c:754 tomoyo_bprm_check_security security/tomoyo/tomoyo.c:101 [inline] tomoyo_bprm_check_security+0x121/0x1a0 security/tomoyo/tomoyo.c:91 security_bprm_check+0x45/0xa0 security/security.c:840 search_binary_handler fs/exec.c:1807 [inline] exec_binprm fs/exec.c:1860 [inline] bprm_execve+0x879/0x1b10 fs/exec.c:1931 kernel_execve+0x370/0x460 fs/exec.c:2080 call_usermodehelper_exec_async+0x27a/0x500 kernel/umh.c:101 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Modules linked in: ---[ end trace cb1162726bba45aa ]--- 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 e4 ea 57 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:ffffc90000da8ac0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff88809913c008 RCX: 0000000000000002 RDX: 0000000000000066 RSI: ffffffff871c542c RDI: 0000000000000330 RBP: ffffffff8d537220 R08: 0000000000000001 R09: ffffffff8c5f3b2f R10: fffffbfff18be765 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000104 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fae1176eda0 CR3: 000000003bc05000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400