[syzbot] [intel-gfx?] general protection fault in i915_pci_probe

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 848acc8ffe1b Merge tag 'fsverity-for-linus' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13245bb9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782
dashboard link: https://syzkaller.appspot.com/bug?extid=db96c5ff032f4292a8dc
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=101513b9580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17245bb9580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-848acc8f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6fb497cc0c8d/vmlinux-848acc8f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/663ccee34982/bzImage-848acc8f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+db96c5...@syzkaller.appspotmail.com

e1000e 0000:00:02.0 eth1: removed PHC
e1000e 0000:00:02.0 eth1: NIC Link is Down
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 2 UID: 0 PID: 5932 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:i915_pci_probe+0x57/0x480 drivers/gpu/drm/i915/i915_pci.c:961
Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 f6 03 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 6c 24 18 4c 8d 6d 1c 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 4c 89 ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 86 03 00 00
RSP: 0018:ffffc900016bf9a0 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff888023150000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: ffffffff85d8d20d RDI: ffffffff8c43a498
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c43a480
R13: 000000000000001c R14: ffffffff85d8d1f0 R15: ffff888023150130
FS: 0000555583377500(0000) GS:ffff8880d5fd8000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff49e597e9c CR3: 0000000023b2c000 CR4: 0000000000352ef0
Call Trace:
<TASK>
local_pci_probe+0xdd/0x1b0 drivers/pci/pci-driver.c:332
pci_call_probe+0x176/0x800 drivers/pci/pci-driver.c:394
__pci_device_probe drivers/pci/pci-driver.c:455 [inline]
pci_device_probe+0x1cd/0x370 drivers/pci/pci-driver.c:489
call_driver_probe drivers/base/dd.c:628 [inline]
really_probe+0x241/0xa60 drivers/base/dd.c:706
__driver_probe_device+0x20e/0x450 drivers/base/dd.c:868
device_driver_attach+0xd1/0x220 drivers/base/dd.c:1203
bind_store+0xf4/0x190 drivers/base/bus.c:267
drv_attr_store+0x74/0xb0 drivers/base/bus.c:125
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f246059e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe32b38f68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f2460825fa0 RCX: 00007f246059e019
RDX: 000000000000000d RSI: 0000200000000180 RDI: 0000000000000005
RBP: 00007f246063500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2460825fac R14: 00007f2460825fa0 R15: 00007f2460825fa0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:i915_pci_probe+0x57/0x480 drivers/gpu/drm/i915/i915_pci.c:961
Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 f6 03 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 6c 24 18 4c 8d 6d 1c 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 4c 89 ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 86 03 00 00
RSP: 0018:ffffc900016bf9a0 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff888023150000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: ffffffff85d8d20d RDI: ffffffff8c43a498
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c43a480
R13: 000000000000001c R14: ffffffff85d8d1f0 R15: ffff888023150130
FS: 0000555583377500(0000) GS:ffff8880d5fd8000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff49e597e9c CR3: 0000000023b2c000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 89 fa mov %edi,%edx
2: 48 c1 ea 03 shr $0x3,%rdx
6: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
a: 0f 85 f6 03 00 00 jne 0x406
10: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
17: fc ff df
1a: 49 8b 6c 24 18 mov 0x18(%r12),%rbp
1f: 4c 8d 6d 1c lea 0x1c(%rbp),%r13
23: 4c 89 ea mov %r13,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction
2e: 4c 89 ea mov %r13,%rdx
31: 83 e2 07 and $0x7,%edx
34: 38 d0 cmp %dl,%al
36: 7f 08 jg 0x40
38: 84 c0 test %al,%al
3a: 0f 85 86 03 00 00 jne 0x3c6


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