general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 PID: 28313 Comm: syz-executor.2 Not tainted 6.5.0-syzkaller-13150-g535a265d7f0d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 RIP: 0010:strchr+0x1b/0xb0 lib/string.c:329 Code: 60 ac f7 48 8b 74 24 08 48 8b 14 24 eb 89 90 f3 0f 1e fa 48 b8 00 00 00 00 00 fc ff df 48 89 fa 55 48 c1 ea 03 53 48 83 ec 10 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 51 0f b6 07 89 RSP: 0018:ffffc90015b67630 EFLAGS: 00010286 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000a0c1000 RDX: 0000000000000000 RSI: 0000000000000025 RDI: 0000000000000000 RBP: ffffc90015b676c0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90015b676c0 R13: 0000000000000cc0 R14: ffff88801d314880 R15: 0000000000000001 FS: 00007f0ec21896c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe4e919d988 CR3: 0000000028360000 CR4: 0000000000350ef0 Call Trace: kvasprintf_const+0x25/0x190 lib/kasprintf.c:45 kobject_set_name_vargs+0x5a/0x130 lib/kobject.c:272 kobject_add_varg lib/kobject.c:366 [inline] kobject_add+0x12a/0x240 lib/kobject.c:424 device_add+0x290/0x1ac0 drivers/base/core.c:3560 nfc_register_device+0x41/0x3c0 net/nfc/core.c:1118 nci_register_device+0x7f4/0xb80 net/nfc/nci/core.c:1257 virtual_ncidev_open+0x147/0x220 drivers/nfc/virtual_ncidev.c:148 misc_open+0x3da/0x4c0 drivers/char/misc.c:165 chrdev_open+0x277/0x700 fs/char_dev.c:414 do_dentry_open+0x88b/0x1730 fs/open.c:929 do_open fs/namei.c:3639 [inline] path_openat+0x19af/0x29c0 fs/namei.c:3796 do_filp_open+0x1de/0x430 fs/namei.c:3823 do_sys_openat2+0x176/0x1e0 fs/open.c:1422 do_sys_open fs/open.c:1437 [inline] __do_sys_openat fs/open.c:1453 [inline] __se_sys_openat fs/open.c:1448 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1448 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0ec147cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0ec21890c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f0ec159bf80 RCX: 00007f0ec147cae9 RDX: 0000000000000002 RSI: 0000000020001280 RDI: ffffffffffffff9c RBP: 00007f0ec2189120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 000000000000000b R14: 00007f0ec159bf80 R15: 00007fffcc509438 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:strchr+0x1b/0xb0 lib/string.c:329 Code: 60 ac f7 48 8b 74 24 08 48 8b 14 24 eb 89 90 f3 0f 1e fa 48 b8 00 00 00 00 00 fc ff df 48 89 fa 55 48 c1 ea 03 53 48 83 ec 10 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 51 0f b6 07 89 RSP: 0018:ffffc90015b67630 EFLAGS: 00010286 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000a0c1000 RDX: 0000000000000000 RSI: 0000000000000025 RDI: 0000000000000000 RBP: ffffc90015b676c0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90015b676c0 R13: 0000000000000cc0 R14: ffff88801d314880 R15: 0000000000000001 FS: 00007f0ec21896c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f122000 CR3: 0000000028360000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: ac lods %ds:(%rsi),%al 1: f7 48 8b 74 24 08 48 testl $0x48082474,-0x75(%rax) 8: 8b 14 24 mov (%rsp),%edx b: eb 89 jmp 0xffffff96 d: 90 nop e: f3 0f 1e fa endbr64 12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 19: fc ff df 1c: 48 89 fa mov %rdi,%rdx 1f: 55 push %rbp 20: 48 c1 ea 03 shr $0x3,%rdx 24: 53 push %rbx 25: 48 83 ec 10 sub $0x10,%rsp * 29: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction 2d: 48 89 fa mov %rdi,%rdx 30: 83 e2 07 and $0x7,%edx 33: 38 d0 cmp %dl,%al 35: 7f 04 jg 0x3b 37: 84 c0 test %al,%al 39: 75 51 jne 0x8c 3b: 0f b6 07 movzbl (%rdi),%eax 3e: 89 .byte 0x89