[syzbot] [usb?] general protection fault in ucsi_acpi_probe (2)

[syzbot <syzbot+e7aa19176573a6992617@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    704340f1cd0d Merge tag 'x86_urgent_for_7.3-rc4' of git://g..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=14358df9580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b454dc6b1b7acd30
dashboard link: https://syzkaller.appspot.com/bug?extid=e7aa19176573a6992617
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10c5bdf9580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14c5bdf9580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a1f812f889ad/disk-704340f1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8aa4ccae83ac/vmlinux-704340f1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8f86a50bf181/bzImage-704340f1.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e7aa19176573a6992617@syzkaller.appspotmail.com

Oops: general protection fault, probably for non-canonical address 0xdffffc00000000fc: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000007e0-0x00000000000007e7]
CPU: 0 UID: 0 PID: 5618 Comm: syz-executor238 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/08/2026
RIP: 0010:ucsi_acpi_probe+0x6c/0x4b0 drivers/usb/typec/ucsi/ucsi_acpi.c:199
Code: 89 74 24 08 4c 8b 23 4c 89 e7 e8 bf 7d cd fd 49 83 c4 f0 45 31 f6 84 c0 4d 0f 45 f4 49 81 c6 e4 07 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 16 04 00 00 41 8b 2e 31 ff 89 ee e8 fb
RSP: 0018:ffffc90004c27ab8 EFLAGS: 00010207
RAX: 00000000000000fc RBX: ffff88801d7ac4e8 RCX: ffff888011e4be80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff8760c1c0 R12: fffffffffffffff0
R13: dffffc0000000000 R14: 00000000000007e4 R15: 1ffff11003af589d
FS:  0000555588eb7400(0000) GS:ffff888125bcb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 0000000045e66000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 platform_probe+0xf9/0x190 drivers/base/platform.c:1507
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x254/0xae0 drivers/base/dd.c:706
 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
 device_driver_attach+0xe0/0x1d0 drivers/base/dd.c:1203
 bind_store+0x1d3/0x220 drivers/base/bus.c:267
 kernfs_fop_write_iter+0x3a5/0x540 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x61e/0xbb0 fs/read_write.c:687
 ksys_write+0x156/0x270 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5d40826649
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 00 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd2d524bb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5d40826649
RDX: 0000000000000007 RSI: 0000200000000600 RDI: 0000000000000006
RBP: 0000000000000001 R08: 0000000000000006 R09: 0000000000000006
R10: 0000000000000006 R11: 0000000000000246 R12: 00007ffd2d524d28
R13: 431bde82d7b634db R14: 00007f5d408b9c40 R15: 0000000000000002
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ucsi_acpi_probe+0x6c/0x4b0 drivers/usb/typec/ucsi/ucsi_acpi.c:199
Code: 89 74 24 08 4c 8b 23 4c 89 e7 e8 bf 7d cd fd 49 83 c4 f0 45 31 f6 84 c0 4d 0f 45 f4 49 81 c6 e4 07 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 16 04 00 00 41 8b 2e 31 ff 89 ee e8 fb
RSP: 0018:ffffc90004c27ab8 EFLAGS: 00010207
RAX: 00000000000000fc RBX: ffff88801d7ac4e8 RCX: ffff888011e4be80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff8760c1c0 R12: fffffffffffffff0
R13: dffffc0000000000 R14: 00000000000007e4 R15: 1ffff11003af589d
FS:  0000555588eb7400(0000) GS:ffff888125ccb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555588eb76d0 CR3: 0000000045e66000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	89 74 24 08          	mov    %esi,0x8(%rsp)
   4:	4c 8b 23             	mov    (%rbx),%r12
   7:	4c 89 e7             	mov    %r12,%rdi
   a:	e8 bf 7d cd fd       	call   0xfdcd7dce
   f:	49 83 c4 f0          	add    $0xfffffffffffffff0,%r12
  13:	45 31 f6             	xor    %r14d,%r14d
  16:	84 c0                	test   %al,%al
  18:	4d 0f 45 f4          	cmovne %r12,%r14
  1c:	49 81 c6 e4 07 00 00 	add    $0x7e4,%r14
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 16 04 00 00    	jne    0x44d
  37:	41 8b 2e             	mov    (%r14),%ebp
  3a:	31 ff                	xor    %edi,%edi
  3c:	89 ee                	mov    %ebp,%esi
  3e:	e8                   	.byte 0xe8
  3f:	fb                   	sti


---
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