Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 UID: 0 PID: 7883 Comm: syz.2.435 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:exfat_nls_to_utf16+0x21c/0xc10
Code: 84 c0 0f 85 d9 02 00 00 48 8b 44 24 20 48 8b 4c 24 10 66 44 89 3c 48 bb 01 00 00 00 eb 6e 4c 8b 7c 24 50 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 f5 2e 8e ff 4c 89 f8 4c 8b 7c 24
RSP: 0018:ffffc90008e57000 EFLAGS: 00010206
RAX: 0000000000000003 RBX: ffffc90008e575f0 RCX: 0000000000000002
RDX: ffff88810c4f1d00 RSI: 00000000000000e3 RDI: 00000000000000ff
RBP: ffffc90008e57550 R08: ffffc90008e5727f R09: 0000000000000000
R10: ffffc90008e57080 R11: fffff520011cae50 R12: dffffc0000000000
R13: 0000000000000000 R14: 1ffff920011caee6 R15: 0000000000000018
FS:  00007efed4c426c0(0000) GS:ffff8880b83fc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f61d47d7dac CR3: 000000010d942000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 exfat_ioctl+0x815/0x1100
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efed3d8ec29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efed4c42038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007efed3fd5fa0 RCX: 00007efed3d8ec29
RDX: 00002000000000c0 RSI: 0000000041009432 RDI: 000000000000000a
RBP: 00007efed3e11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efed3fd6038 R14: 00007efed3fd5fa0 R15: 00007fff2720f568
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:exfat_nls_to_utf16+0x21c/0xc10
Code: 84 c0 0f 85 d9 02 00 00 48 8b 44 24 20 48 8b 4c 24 10 66 44 89 3c 48 bb 01 00 00 00 eb 6e 4c 8b 7c 24 50 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 f5 2e 8e ff 4c 89 f8 4c 8b 7c 24
RSP: 0018:ffffc90008e57000 EFLAGS: 00010206
RAX: 0000000000000003 RBX: ffffc90008e575f0 RCX: 0000000000000002
RDX: ffff88810c4f1d00 RSI: 00000000000000e3 RDI: 00000000000000ff
RBP: ffffc90008e57550 R08: ffffc90008e5727f R09: 0000000000000000
R10: ffffc90008e57080 R11: fffff520011cae50 R12: dffffc0000000000
R13: 0000000000000000 R14: 1ffff920011caee6 R15: 0000000000000018
FS:  00007efed4c426c0(0000) GS:ffff8880b83fc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f61d47d7dac CR3: 000000010d942000 CR4: 00000000000006f0
