[syzbot] [fuse?] general protection fault in fuse_do_readpage

[syzbot <syzbot+0b1279812c46e48bb0c1@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    c1e939a21eb1 Merge tag 'cgroup-for-6.12-rc5-fixes' of git:..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=173f255f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4340261e4e9f37fc
dashboard link: https://syzkaller.appspot.com/bug?extid=0b1279812c46e48bb0c1
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12401540580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10e64630580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-c1e939a2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5f1b9c52b9e0/vmlinux-c1e939a2.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8f31f28c172e/bzImage-c1e939a2.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0b1279812c46e48bb0c1@syzkaller.appspotmail.com

Oops: general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]
CPU: 3 UID: 0 PID: 5947 Comm: syz-executor314 Not tainted 6.12.0-rc5-syzkaller-00044-gc1e939a21eb1 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:fuse_read_args_fill fs/fuse/file.c:631 [inline]
RIP: 0010:fuse_do_readpage+0x276/0x640 fs/fuse/file.c:880
Code: e8 9f c7 91 fe 8b 44 24 10 89 44 24 78 41 89 c4 e8 8f c7 91 fe 48 8d 7b 60 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1d 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b
RSP: 0018:ffffc90006a0f820 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff82fbb4c9
RDX: 000000000000000c RSI: ffffffff82fbb4f1 RDI: 0000000000000060
RBP: 0000000000000000 R08: 0000000000000007 R09: 7fffffffffffffff
R10: 0000000000000fff R11: ffffffff961d4b88 R12: 0000000000001000
R13: ffff8880382b8000 R14: ffff888025153780 R15: ffffc90006a0f8b8
FS:  00007f7583f3d6c0(0000) GS:ffff88806a900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000240 CR3: 0000000030d30000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 fuse_read_folio+0xb0/0x100 fs/fuse/file.c:905
 filemap_read_folio+0xc6/0x2a0 mm/filemap.c:2367
 do_read_cache_folio+0x263/0x5c0 mm/filemap.c:3825
 read_mapping_folio include/linux/pagemap.h:1011 [inline]
 erofs_bread+0x34d/0x7e0 fs/erofs/data.c:41
 erofs_read_superblock fs/erofs/super.c:281 [inline]
 erofs_fc_fill_super+0x2b9/0x2500 fs/erofs/super.c:625
 vfs_get_super fs/super.c:1280 [inline]
 get_tree_nodev+0xda/0x190 fs/super.c:1299
 erofs_fc_get_tree+0x1fe/0x2e0 fs/erofs/super.c:723
 vfs_get_tree+0x8f/0x380 fs/super.c:1800
 do_new_mount fs/namespace.c:3507 [inline]
 path_mount+0x14e6/0x1f20 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount fs/namespace.c:4034 [inline]
 __x64_sys_mount+0x294/0x320 fs/namespace.c:4034
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7583f813b9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7583f3d218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f758400d3e8 RCX: 00007f7583f813b9
RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 0000000020000240
RBP: 00007f758400d3e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000010000 R11: 0000000000000246 R12: 00007f7583fda034
R13: 0030656c69662f2e R14: 00007f7583fda050 R15: 00007f7583fd800e
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:fuse_read_args_fill fs/fuse/file.c:631 [inline]
RIP: 0010:fuse_do_readpage+0x276/0x640 fs/fuse/file.c:880
Code: e8 9f c7 91 fe 8b 44 24 10 89 44 24 78 41 89 c4 e8 8f c7 91 fe 48 8d 7b 60 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1d 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b
RSP: 0018:ffffc90006a0f820 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff82fbb4c9
RDX: 000000000000000c RSI: ffffffff82fbb4f1 RDI: 0000000000000060
RBP: 0000000000000000 R08: 0000000000000007 R09: 7fffffffffffffff
R10: 0000000000000fff R11: ffffffff961d4b88 R12: 0000000000001000
R13: ffff8880382b8000 R14: ffff888025153780 R15: ffffc90006a0f8b8
FS:  00007f7583f3d6c0(0000) GS:ffff88806a900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000240 CR3: 0000000030d30000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	e8 9f c7 91 fe       	call   0xfe91c7a4
   5:	8b 44 24 10          	mov    0x10(%rsp),%eax
   9:	89 44 24 78          	mov    %eax,0x78(%rsp)
   d:	41 89 c4             	mov    %eax,%r12d
  10:	e8 8f c7 91 fe       	call   0xfe91c7a4
  15:	48 8d 7b 60          	lea    0x60(%rbx),%rdi
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  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:	0f 85 1d 03 00 00    	jne    0x351
  34:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  3b:	fc ff df
  3e:	48                   	rex.W
  3f:	8b                   	.byte 0x8b


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup