md: md_import_device returned -12
md: invalid raid superblock magic on mtdblock0
md: mtdblock0 does not have a valid v0.0 superblock, not importing!
==================================================================
md: md_import_device returned -22
BUG: KASAN: use-after-free in disk_unblock_events+0x4b/0x50 block/genhd.c:1644
Read of size 8 at addr ffff888090208608 by task syz-executor.5/9093
CPU: 1 PID: 9093 Comm: syz-executor.5 Not tainted 4.14.174-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x13e/0x194 lib/dump_stack.c:58
print_address_description.cold+0x7c/0x1e2 mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report mm/kasan/report.c:409 [inline]
kasan_report.cold+0xa9/0x2ae mm/kasan/report.c:393
disk_unblock_events+0x4b/0x50 block/genhd.c:1644
__blkdev_get+0x79c/0x10d0 fs/block_dev.c:1556
md: invalid raid superblock magic on mtdblock0
blkdev_get+0x84/0x8a0 fs/block_dev.c:1612
md: mtdblock0 does not have a valid v0.0 superblock, not importing!
blkdev_open+0x1cc/0x250 fs/block_dev.c:1770
do_dentry_open+0x732/0xe90 fs/open.c:777
md: md_import_device returned -22
vfs_open+0x105/0x220 fs/open.c:888
do_last fs/namei.c:3428 [inline]
path_openat+0x8ca/0x3c50 fs/namei.c:3569
do_filp_open+0x18e/0x250 fs/namei.c:3603
md: invalid raid superblock magic on mtdblock0
do_sys_open+0x29d/0x3f0 fs/open.c:1081
md: mtdblock0 does not have a valid v0.0 superblock, not importing!
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c849
RSP: 002b:00007f148e59bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f148e59c6d4 RCX: 000000000045c849
RDX: 0000000000000000 RSI: 0000000020000080 RDI: ffffffffffffff9c
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000007a6 R14: 00000000004ca56b R15: 000000000076bf0c
Allocated by task 8862:
save_stack+0x32/0xa0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc mm/kasan/kasan.c:551 [inline]
kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529
kmem_cache_alloc_node_trace+0x15a/0x7b0 mm/slab.c:3661
kmalloc_node include/linux/slab.h:526 [inline]
kzalloc_node include/linux/slab.h:672 [inline]
alloc_disk_node+0x5d/0x3d0 block/genhd.c:1387
md_alloc+0x20e/0x810 drivers/md/md.c:5322
md_probe+0x28/0x40 drivers/md/md.c:5379
kobj_lookup+0x221/0x410 drivers/base/map.c:124
get_gendisk+0x36/0x240 block/genhd.c:785
md: md_import_device returned -22
__blkdev_get+0x384/0x10d0 fs/block_dev.c:1451
blkdev_get+0x84/0x8a0 fs/block_dev.c:1612
blkdev_open+0x1cc/0x250 fs/block_dev.c:1770
do_dentry_open+0x732/0xe90 fs/open.c:777
vfs_open+0x105/0x220 fs/open.c:888
do_last fs/namei.c:3428 [inline]
path_openat+0x8ca/0x3c50 fs/namei.c:3569
do_filp_open+0x18e/0x250 fs/namei.c:3603
do_sys_open+0x29d/0x3f0 fs/open.c:1081
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
md: invalid raid superblock magic on mtdblock0
Freed by task 9093:
save_stack+0x32/0xa0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524
__cache_free mm/slab.c:3496 [inline]
kfree+0xcb/0x260 mm/slab.c:3815
device_release+0xf0/0x1a0 drivers/base/core.c:831
kobject_cleanup lib/kobject.c:646 [inline]
kobject_release lib/kobject.c:675 [inline]
kref_put include/linux/kref.h:70 [inline]
kobject_put+0x13e/0x1f0 lib/kobject.c:692
md: mtdblock0 does not have a valid v0.0 superblock, not importing!
put_disk+0x1f/0x30 block/genhd.c:1452
__blkdev_get+0x707/0x10d0 fs/block_dev.c:1549
blkdev_get+0x84/0x8a0 fs/block_dev.c:1612
blkdev_open+0x1cc/0x250 fs/block_dev.c:1770
do_dentry_open+0x732/0xe90 fs/open.c:777
vfs_open+0x105/0x220 fs/open.c:888
do_last fs/namei.c:3428 [inline]
path_openat+0x8ca/0x3c50 fs/namei.c:3569
do_filp_open+0x18e/0x250 fs/namei.c:3603
do_sys_open+0x29d/0x3f0 fs/open.c:1081
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
The buggy address belongs to the object at ffff888090208080
which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 1416 bytes inside of
2048-byte region [ffff888090208080, ffff888090208880)
The buggy address belongs to the page:
md: md_import_device returned -22
page:ffffea0002408200 count:1 mapcount:0 mapping:ffff888090208080 index:0x0 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffff888090208080 0000000000000000 0000000100000003
raw: ffffea0002802720 ffffea00013636a0 ffff88812fe56c40 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888090208500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888090208580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888090208600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
md: invalid raid superblock magic on mtdblock0
ffff888090208680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888090208700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================