[syzbot] [kernel?] general protection fault in joydev_connect

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    0468be89b3fa Merge tag 'iommu-updates-v6.6' of git://git.k..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15d71367a80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=39744401c57166fc
dashboard link: https://syzkaller.appspot.com/bug?extid=786b124fe4ce4dc99357
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-0468be89.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7feba36779de/vmlinux-0468be89.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b1cdc0506491/bzImage-0468be89.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+786b124fe4ce4dc99357@xxxxxxxxxxxxxxxxxxxxxxxxx

RBP: 00007fa0905fe120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 000000000000000b R14: 00007fa091b9bf80 R15: 00007ffd2d08f908
 </TASK>
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 3 PID: 7070 Comm: syz-executor.3 Not tainted 6.5.0-syzkaller-10885-g0468be89b3fa #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: 48 ad 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:ffffc90006d479e0 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000c2ca000
RDX: 0000000000000000 RSI: 0000000000000025 RDI: 0000000000000000
RBP: ffffc90006d47a70 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90006d47a70
R13: 0000000000000cc0 R14: ffff888029f072f0 R15: 0000000000000001
FS:  00007fa0905fe6c0(0000) GS:ffff88806b900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005595cf80f000 CR3: 000000010b7d5000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 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
 cdev_device_add+0x12b/0x270 fs/char_dev.c:556
 joydev_connect+0xbdc/0x1030 drivers/input/joydev.c:1001
 input_attach_handler.isra.0+0x17c/0x250 drivers/input/input.c:1064
 input_register_device+0xb1e/0x1130 drivers/input/input.c:2396
 uinput_create_device drivers/input/misc/uinput.c:365 [inline]
 uinput_ioctl_handler.isra.0+0x1308/0x1d70 drivers/input/misc/uinput.c:904
 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: 0033:0x7fa091a7cae9
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:00007fa0905fe0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa091b9bf80 RCX: 00007fa091a7cae9
RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000003
RBP: 00007fa0905fe120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 000000000000000b R14: 00007fa091b9bf80 R15: 00007ffd2d08f908
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:strchr+0x1b/0xb0 lib/string.c:329
Code: 48 ad 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:ffffc90006d479e0 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000c2ca000
RDX: 0000000000000000 RSI: 0000000000000025 RDI: 0000000000000000
RBP: ffffc90006d47a70 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90006d47a70
R13: 0000000000000cc0 R14: ffff888029f072f0 R15: 0000000000000001
FS:  00007fa0905fe6c0(0000) GS:ffff88806b900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005595cf80f000 CR3: 000000010b7d5000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	48 ad                	lods   %ds:(%rsi),%rax
   2:	f7 48 8b 74 24 08 48 	testl  $0x48082474,-0x75(%rax)
   9:	8b 14 24             	mov    (%rsp),%edx
   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


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