[Android 5.15] general protection fault in filename_create

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 6d40cb68a657 Revert "HID: core: Provide new max_buffer_siz..
git tree: android13-5.15-lts
console+strace: https://syzkaller.appspot.com/x/log.txt?x=118b1b58280000
kernel config: https://syzkaller.appspot.com/x/.config?x=ea7fc38b3c1ba568
dashboard link: https://syzkaller.appspot.com/bug?extid=109482120fd91264a45b
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11fb1f94280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=137dead8280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/1c4154b729ee/disk-6d40cb68.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/850cf23a3bae/vmlinux-6d40cb68.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4aa532289036/bzImage-6d40cb68.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+109482...@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 0 PID: 294 Comm: syz-executor236 Not tainted 5.15.104-syzkaller-01328-g6d40cb68a657 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
RIP: 0010:__d_entry_type include/linux/dcache.h:404 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:409 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:455 [inline]
RIP: 0010:d_is_positive include/linux/dcache.h:465 [inline]
RIP: 0010:filename_create+0x2d2/0x520 fs/namei.c:3771
Code: 92 00 00 00 4c 89 7c 24 28 45 84 e4 0f 95 c0 83 7c 24 14 00 0f 94 c3 20 c3 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 1f 02 00 00 45 8b 26 41 bd 00 00 70 00 be
RSP: 0018:ffffc90000997d20 EFLAGS: 00010202
RAX: 0000000000000004 RBX: 1ffff92000132f00 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000
RBP: ffffc90000997e10 R08: ffffffff81be9c40 R09: ffffed10238a48d8
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000600 R14: 0000000000000020 R15: ffffc90000997e80
FS: 00007f4a9c883700(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558666ad73d8 CR3: 000000011c905000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
do_mkdirat+0xbd/0x450 fs/namei.c:4009
__do_sys_mkdirat fs/namei.c:4034 [inline]
__se_sys_mkdirat fs/namei.c:4032 [inline]
__x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4032
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f4a9c8f2499
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 14 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4a9c8832f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f4a9c97c4d0 RCX: 00007f4a9c8f2499
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 00000000ffffff9c
RBP: 00007f4a9c94a024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd80cac5ae
R13: 00007f4a9c94a040 R14: 2f30656c69662f2e R15: 00007f4a9c97c4d8
</TASK>
Modules linked in:
---[ end trace 949c210d9c539be5 ]---
RIP: 0010:__d_entry_type include/linux/dcache.h:404 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:409 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:455 [inline]
RIP: 0010:d_is_positive include/linux/dcache.h:465 [inline]
RIP: 0010:filename_create+0x2d2/0x520 fs/namei.c:3771
Code: 92 00 00 00 4c 89 7c 24 28 45 84 e4 0f 95 c0 83 7c 24 14 00 0f 94 c3 20 c3 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 1f 02 00 00 45 8b 26 41 bd 00 00 70 00 be
RSP: 0018:ffffc90000997d20 EFLAGS: 00010202
RAX: 0000000000000004 RBX: 1ffff92000132f00 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000
RBP: ffffc90000997e10 R08: ffffffff81be9c40 R09: ffffed10238a48d8
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000600 R14: 0000000000000020 R15: ffffc90000997e80
FS: 00007f4a9c883700(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558666ad73d8 CR3: 000000011c905000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 92 xchg %eax,%edx
1: 00 00 add %al,(%rax)
3: 00 4c 89 7c add %cl,0x7c(%rcx,%rcx,4)
7: 24 28 and $0x28,%al
9: 45 84 e4 test %r12b,%r12b
c: 0f 95 c0 setne %al
f: 83 7c 24 14 00 cmpl $0x0,0x14(%rsp)
14: 0f 94 c3 sete %bl
17: 20 c3 and %al,%bl
19: 4c 89 f0 mov %r14,%rax
1c: 48 c1 e8 03 shr $0x3,%rax
20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
27: fc ff df
* 2a: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 0f 85 1f 02 00 00 jne 0x255
36: 45 8b 26 mov (%r14),%r12d
39: 41 bd 00 00 70 00 mov $0x700000,%r13d
3f: be .byte 0xbe


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