attempt to access beyond end of device
loop2: rw=2049, want=130, limit=112
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8845 Comm: syz-executor0 Not tainted 4.19.0-rc4-next-20180920+ #76
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
kobject: 'loop1' (00000000b802f40b): kobject_uevent_env
RIP: 0010:open_ubi fs/ubifs/super.c:1964 [inline]
RIP: 0010:ubifs_mount+0x1b5/0x75fe fs/ubifs/super.c:2152
Code: ff ff e8 4e e4 01 ff 49 81 ff 00 f0 ff ff 0f 86 fe 03 00 00 e8 0c e3 01 ff 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 48 89 da 83 e2 07 38 d0 7f 08 84 c0 0f 85 93 1a 00 00
RSP: 0018:ffff880194e57620 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90009949000
RDX: 0000000000000000 RSI: ffffffff827b6ce4 RDI: 0000000000000007
kobject: 'loop1' (00000000b802f40b): fill_kobj_path: path = '/devices/virtual/block/loop1'
RBP: ffff880194e57b88 R08: ffff88019dc9c340 R09: ffffed003b5a5b57
attempt to access beyond end of device
R10: ffffed003b5a5b57 R11: ffff8801dad2dabb R12: 0000000000000000
R13: ffffffff89990a60 R14: ffff880194e57b60 R15: ffffffffffffffea
FS:  00007f105d522700(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32820000 CR3: 00000001be9f2000 CR4: 00000000001406e0
Call Trace:
loop3: rw=2049, want=130, limit=112
kobject: 'loop1' (00000000b802f40b): kobject_uevent_env
 legacy_get_tree+0x131/0x460 fs/fs_context.c:721
 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1787
kobject: 'loop1' (00000000b802f40b): fill_kobj_path: path = '/devices/virtual/block/loop1'
 do_new_mount fs/namespace.c:2633 [inline]
 do_mount+0x70c/0x1db0 fs/namespace.c:2959
 ksys_mount+0x12d/0x140 fs/namespace.c:3175
 __do_sys_mount fs/namespace.c:3189 [inline]
 __se_sys_mount fs/namespace.c:3186 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3186
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457679
Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f105d521c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f105d5226d4 RCX: 0000000000457679
RDX: 0000000020fdb000 RSI: 0000000020d78000 RDI: 0000000020000240
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d3b58 R14: 00000000004c297a R15: 0000000000000000
Modules linked in:
---[ end trace a624b743bb28a392 ]---
RIP: 0010:open_ubi fs/ubifs/super.c:1964 [inline]
RIP: 0010:ubifs_mount+0x1b5/0x75fe fs/ubifs/super.c:2152
Code: ff ff e8 4e e4 01 ff 49 81 ff 00 f0 ff ff 0f 86 fe 03 00 00 e8 0c e3 01 ff 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 48 89 da 83 e2 07 38 d0 7f 08 84 c0 0f 85 93 1a 00 00
kobject: 'loop5' (00000000afa50b50): kobject_uevent_env
kobject: 'loop5' (00000000afa50b50): fill_kobj_path: path = '/devices/virtual/block/loop5'
RSP: 0018:ffff880194e57620 EFLAGS: 00010246
kobject: 'loop1' (00000000b802f40b): kobject_uevent_env
kobject: 'loop1' (00000000b802f40b): fill_kobj_path: path = '/devices/virtual/block/loop1'
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90009949000
RDX: 0000000000000000 RSI: ffffffff827b6ce4 RDI: 0000000000000007
RBP: ffff880194e57b88 R08: ffff88019dc9c340 R09: ffffed003b5a5b57
R10: ffffed003b5a5b57 R11: ffff8801dad2dabb R12: 0000000000000000
R13: ffffffff89990a60 R14: ffff880194e57b60 R15: ffffffffffffffea
FS:  00007f105d522700(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000
kobject: 'loop2' (0000000078a660c4): kobject_uevent_env
kobject: 'loop2' (0000000078a660c4): fill_kobj_path: path = '/devices/virtual/block/loop2'
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 00000001be9f2000 CR4: 00000000001406e0