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Subjectgeneral protection fault in reset_interrupt
Hello,

When using Healer to fuzz the latest Linux kernel, the following crash
was triggered.

HEAD commit: 519d81956ee2 Linux 5.15-rc6
git tree: upstream
console output:
https://drive.google.com/file/d/1bzxncErwj8l-KA-R-jLCUajYQMReiAWX/view?usp=sharing
kernel config: https://drive.google.com/file/d/12PUnxIM1EPBgW4ZJmI7WJBRaY1lA83an/view?usp=sharing
Syzlang reproducer:
https://drive.google.com/file/d/1IOQR_MqiSkN8y0m3UjFZcP9l5QcBnCIv/view?usp=sharing

Sorry, I don't have a C reproducer for this crash, hope the Syzlang
reproducer and symbolized report can help.
If you fix this issue, please add the following tag to the commit:
Reported-by: Hao Sun <sunhao.th@gmail.com>

floppy0: Unable to send byte 6f to FDC. Fdc=0 Status=d0

floppy driver state
-------------------
now=4295008404 last interrupt=4295008403 diff=1 last called
handler=reset_interrupt
timeout_message=floppy start
last output bytes:
10 90 4294978780
7 80 4294978780
0 90 4294978780
8 80 4294978780
f 80 4294978780
0 90 4294978780
1 90 4294978780
8 80 4294978780
4 80 4294978785
0 90 4294978785
f 80 4294978785
0 90 4294978785
8 80 4294978785
0 90 4294978785
d8 80 4295008402
8 80 4295008403
8 80 4295008403
8 80 4295008403
8 80 4295008403
d8 80 4295008404
last result at 4295008403
last redo_fd_request at 4295008403
status=d0
fdc_busy=1
floppy_work.func=floppy_work_workfn
timer_function=ffffffff8476f5f0 expires=298
cont=ffffffff89fe0d80
current_req=0000000000000000
command_status=-1

general protection fault, probably for non-canonical address
0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 10 Comm: kworker/u8:1 Not tainted 5.15.0-rc6 #4
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
Workqueue: floppy floppy_work_workfn
RIP: 0010:reset_interrupt+0xef/0x140 drivers/block/floppy.c:1792
Code: fc 84 db 0f 85 71 58 8e 04 e8 4d 4d ff fc 48 8b 1d 86 47 db 0b
48 b8 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 fa 48 c1 ea 03 <80> 3c
02 00 75 40 48 8b 43 08 5b ff e0 e8 0f dd 46 fd eb a8 e8 08
RSP: 0018:ffffc900006d7d28 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8880118d9c80
RDX: 0000000000000001 RSI: ffff8880118d9c80 RDI: 0000000000000008
RBP: ffffffff8c482f00 R08: ffffffff84771173 R09: 0000000000000000
R10: 0000000000000001 R11: fffffbfff1adb1ba R12: ffffc900006d7dc8
R13: ffffffff8c482f10 R14: ffff888011968000 R15: ffff888010c71800
FS: 0000000000000000(0000) GS:ffff888135c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3397e36db8 CR3: 0000000020a83000 CR4: 0000000000350ee0
Call Trace:
process_one_work+0x9df/0x16d0 kernel/workqueue.c:2297
worker_thread+0x90/0xed0 kernel/workqueue.c:2444
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Modules linked in:
Dumping ftrace buffer:
(ftrace buffer empty)
---[ end trace 24ebcf9665bb7032 ]---
RIP: 0010:reset_interrupt+0xef/0x140 drivers/block/floppy.c:1792
Code: fc 84 db 0f 85 71 58 8e 04 e8 4d 4d ff fc 48 8b 1d 86 47 db 0b
48 b8 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 fa 48 c1 ea 03 <80> 3c
02 00 75 40 48 8b 43 08 5b ff e0 e8 0f dd 46 fd eb a8 e8 08
RSP: 0018:ffffc900006d7d28 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8880118d9c80
RDX: 0000000000000001 RSI: ffff8880118d9c80 RDI: 0000000000000008
RBP: ffffffff8c482f00 R08: ffffffff84771173 R09: 0000000000000000
R10: 0000000000000001 R11: fffffbfff1adb1ba R12: ffffc900006d7dc8
R13: ffffffff8c482f10 R14: ffff888011968000 R15: ffff888010c71800
FS: 0000000000000000(0000) GS:ffff888063f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 00000000277d1000 CR4: 0000000000350ee0
----------------
Code disassembly (best guess):
0: fc cld
1: 84 db test %bl,%bl
3: 0f 85 71 58 8e 04 jne 0x48e587a
9: e8 4d 4d ff fc callq 0xfcff4d5b
e: 48 8b 1d 86 47 db 0b mov 0xbdb4786(%rip),%rbx # 0xbdb479b
15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
1c: fc ff df
1f: 48 8d 7b 08 lea 0x8(%rbx),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 75 40 jne 0x70
30: 48 8b 43 08 mov 0x8(%rbx),%rax
34: 5b pop %rbx
35: ff e0 jmpq *%rax
37: e8 0f dd 46 fd callq 0xfd46dd4b
3c: eb a8 jmp 0xffffffe6
3e: e8 .byte 0xe8
3f: 08 .byte 0x8

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