RBP: 00007f1cfce64120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 000000000000000b R14: 00007f1cfc19bf80 R15: 00007ffc4fd31428 general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 2 PID: 7129 Comm: syz-executor.2 Not tainted 6.6.0-rc1-syzkaller-00196-g57d88e8a5974 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:strchr+0x1b/0xb0 lib/string.c:329 Code: 8e ab 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:ffffc90021f5f8e0 EFLAGS: 00010282 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90003d71000 RDX: 0000000000000000 RSI: 0000000000000025 RDI: 0000000000000000 RBP: ffffc90021f5f970 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90021f5f970 R13: 0000000000000cc0 R14: ffff888102bb4680 R15: 0000000000000001 FS: 00007f1cfce646c0(0000) GS:ffff88806b800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1e2a775198 CR3: 000000011a45a000 CR4: 0000000000350ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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 netdev_register_kobject+0x183/0x3f0 net/core/net-sysfs.c:2044 register_netdevice+0xbcb/0x1490 net/core/dev.c:10136 register_netdev+0x2f/0x50 net/core/dev.c:10266 sixpack_open+0x7be/0xb30 drivers/net/hamradio/6pack.c:624 tty_ldisc_open+0x98/0x100 drivers/tty/tty_ldisc.c:432 tty_set_ldisc+0x2e2/0x680 drivers/tty/tty_ldisc.c:557 tiocsetd drivers/tty/tty_io.c:2431 [inline] tty_ioctl+0xbda/0x1580 drivers/tty/tty_io.c:2712 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857 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: 0033:0x7f1cfc07cae9 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:00007f1cfce640c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f1cfc19bf80 RCX: 00007f1cfc07cae9 RDX: 0000000020000240 RSI: 0000000000005423 RDI: 0000000000000004 RBP: 00007f1cfce64120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 000000000000000b R14: 00007f1cfc19bf80 R15: 00007ffc4fd31428 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:strchr+0x1b/0xb0 lib/string.c:329 Code: 8e ab 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:ffffc90021f5f8e0 EFLAGS: 00010282 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90003d71000 RDX: 0000000000000000 RSI: 0000000000000025 RDI: 0000000000000000 RBP: ffffc90021f5f970 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90021f5f970 R13: 0000000000000cc0 R14: ffff888102bb4680 R15: 0000000000000001 FS: 00007f1cfce646c0(0000) GS:ffff88806b600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f40ce665ff8 CR3: 000000011a45a000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 8e ab f7 48 8b 74 mov 0x748b48f7(%rbx),%gs 6: 24 08 and $0x8,%al 8: 48 8b 14 24 mov (%rsp),%rdx c: eb 89 jmp 0xffffff97 e: 90 nop f: f3 0f 1e fa endbr64 13: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1a: fc ff df 1d: 48 89 fa mov %rdi,%rdx 20: 55 push %rbp 21: 48 c1 ea 03 shr $0x3,%rdx 25: 53 push %rbx 26: 48 83 ec 10 sub $0x10,%rsp * 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction 2e: 48 89 fa mov %rdi,%rdx 31: 83 e2 07 and $0x7,%edx 34: 38 d0 cmp %dl,%al 36: 7f 04 jg 0x3c 38: 84 c0 test %al,%al 3a: 75 51 jne 0x8d 3c: 0f b6 07 movzbl (%rdi),%eax 3f: 89 .byte 0x89