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BUG: KASAN: use-after-free in bdev_nr_sectors include/linux/genhd.h:266 [inline]
BUG: KASAN: use-after-free in disk_part_iter_next+0x49d/0x530 block/genhd.c:206
Read of size 8 at addr ffff8881423150a8 by task systemd-udevd/10870
CPU: 0 PID: 10870 Comm: systemd-udevd Not tainted 5.12.0-rc4-next-20210326-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x141/0x1d7 lib/dump_stack.c:120
print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232
__kasan_report mm/kasan/report.c:399 [inline]
kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416
bdev_nr_sectors include/linux/genhd.h:266 [inline]
disk_part_iter_next+0x49d/0x530 block/genhd.c:206
blk_drop_partitions+0x10a/0x180 block/partitions/core.c:541
bdev_disk_changed+0x211/0x3c0 fs/block_dev.c:1244
__loop_clr_fd+0x7c7/0xff0 drivers/block/loop.c:1272
lo_release+0x1ac/0x1f0 drivers/block/loop.c:1924
__blkdev_put+0x5d4/0x790 fs/block_dev.c:1588
blkdev_put+0x92/0x580 fs/block_dev.c:1641
blkdev_close+0x8c/0xb0 fs/block_dev.c:1649
__fput+0x288/0x920 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:143
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f15d9e70270
Code: 73 01 c3 48 8b 0d 38 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 59 c1 20 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ee fb ff ff 48 89 04 24
RSP: 002b:00007ffd11f50a38 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f15d9e70270
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 00007f15dad2a710 R08: 00005619edade3a0 R09: 00005619edac4700
R10: 00007f15dad2a8c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00005619edad8520 R14: 0000000000000003 R15: 000000000000000e
Allocated by task 10754:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:428 [inline]
__kasan_slab_alloc+0x84/0xa0 mm/kasan/common.c:461
kasan_slab_alloc include/linux/kasan.h:236 [inline]
slab_post_alloc_hook mm/slab.h:525 [inline]
slab_alloc_node mm/slub.c:2909 [inline]
slab_alloc mm/slub.c:2917 [inline]
kmem_cache_alloc+0x212/0x390 mm/slub.c:2922
bdev_alloc_inode+0x18/0x80 fs/block_dev.c:795
alloc_inode+0x61/0x230 fs/inode.c:234
new_inode_pseudo fs/inode.c:928 [inline]
new_inode+0x27/0x2f0 fs/inode.c:957
bdev_alloc+0x20/0x2f0 fs/block_dev.c:885
add_partition+0x1ab/0x880 block/partitions/core.c:346
bdev_add_partition+0xb6/0x130 block/partitions/core.c:449
blkpg_do_ioctl+0x2d0/0x340 block/ioctl.c:43
blkpg_ioctl block/ioctl.c:60 [inline]
blkdev_ioctl+0x577/0x6d0 block/ioctl.c:548
block_ioctl+0xf9/0x140 fs/block_dev.c:1667
vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl fs/ioctl.c:739 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xae
Freed by task 11720:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
____kasan_slab_free mm/kasan/common.c:360 [inline]
____kasan_slab_free mm/kasan/common.c:325 [inline]
__kasan_slab_free+0xfb/0x130 mm/kasan/common.c:368
kasan_slab_free include/linux/kasan.h:212 [inline]
slab_free_hook mm/slub.c:1578 [inline]
slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1603
slab_free mm/slub.c:3163 [inline]
kmem_cache_free+0x8a/0x730 mm/slub.c:3179
i_callback+0x3f/0x70 fs/inode.c:223
rcu_do_batch kernel/rcu/tree.c:2559 [inline]
rcu_core+0x7ab/0x13b0 kernel/rcu/tree.c:2794
__do_softirq+0x29b/0x9f6 kernel/softirq.c:559
Last potentially related work creation:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345
__call_rcu kernel/rcu/tree.c:3039 [inline]
call_rcu+0xb1/0x750 kernel/rcu/tree.c:3114
destroy_inode+0x129/0x1b0 fs/inode.c:289
iput_final fs/inode.c:1654 [inline]
iput.part.0+0x57e/0x810 fs/inode.c:1680
iput+0x58/0x70 fs/inode.c:1670
disk_part_iter_exit block/genhd.c:235 [inline]
disk_part_iter_next+0x9a/0x530 block/genhd.c:202
blk_drop_partitions+0x10a/0x180 block/partitions/core.c:541
bdev_disk_changed+0x211/0x3c0 fs/block_dev.c:1244
loop_reread_partitions+0x29/0x50 drivers/block/loop.c:656
loop_set_status+0x704/0x1050 drivers/block/loop.c:1419
loop_set_status64 drivers/block/loop.c:1539 [inline]
lo_ioctl+0x4ca/0x1620 drivers/block/loop.c:1707
blkdev_ioctl+0x2a1/0x6d0 block/ioctl.c:583
block_ioctl+0xf9/0x140 fs/block_dev.c:1667
vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl fs/ioctl.c:739 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xae
The buggy address belongs to the object at ffff888142315080
which belongs to the cache bdev_cache of size 2784
The buggy address is located 40 bytes inside of
2784-byte region [ffff888142315080, ffff888142315b60)
The buggy address belongs to the page:
page:ffffea000508c400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x142310
head:ffffea000508c400 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x57ff00000010200(slab|head|node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000010200 dead000000000100 dead000000000122 ffff8880109bdc80
raw: 0000000000000000 00000000800b000b 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888142314f80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
ffff888142315000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888142315080: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888142315100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888142315180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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