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BUG: KASAN: use-after-free in atomic64_read include/asm-generic/atomic-instrumented.h:27 [inline]
BUG: KASAN: use-after-free in atomic_long_read include/asm-generic/atomic-long.h:47 [inline]
BUG: KASAN: use-after-free in __mutex_unlock_slowpath+0x9b/0x6b0 kernel/locking/mutex.c:1206
Read of size 8 at addr ffff888087fb1418 by task syz-executor.4/11779
CPU: 0 PID: 11779 Comm: syz-executor.4 Not tainted 4.19.98-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x197/0x210 lib/dump_stack.c:118
print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report mm/kasan/report.c:412 [inline]
kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396
check_memory_region_inline mm/kasan/kasan.c:260 [inline]
check_memory_region+0x123/0x190 mm/kasan/kasan.c:267
kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272
atomic64_read include/asm-generic/atomic-instrumented.h:27 [inline]
atomic_long_read include/asm-generic/atomic-long.h:47 [inline]
__mutex_unlock_slowpath+0x9b/0x6b0 kernel/locking/mutex.c:1206
mutex_unlock+0xd/0x10 kernel/locking/mutex.c:713
blkdev_get+0x5a4/0x990 fs/block_dev.c:1671
blkdev_get_by_dev+0x42/0x80 fs/block_dev.c:1750
lock_rdev+0xa0/0x160 drivers/md/md.c:2307
md_import_device+0x221/0x520 drivers/md/md.c:3488
add_new_disk+0x593/0x18c0 drivers/md/md.c:6347
md_ioctl+0x45d4/0x5980 drivers/md/md.c:7365
__blkdev_driver_ioctl block/ioctl.c:303 [inline]
blkdev_ioctl+0xc2c/0x1ab3 block/ioctl.c:601
block_ioctl+0xee/0x130 fs/block_dev.c:1894
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:688
ksys_ioctl+0xab/0xd0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:710
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45b349
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f2b7b7d1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2b7b7d26d4 RCX: 000000000045b349
RDX: 0000000020001200 RSI: 0000000040140921 RDI: 0000000000000006
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000219 R14: 00000000004c2ee9 R15: 000000000075bf2c
Allocated by task 11779:
save_stack+0x45/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc mm/kasan/kasan.c:553 [inline]
kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531
kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:490
kmem_cache_alloc+0x12e/0x700 mm/slab.c:3559
bdev_alloc_inode+0x1c/0x50 fs/block_dev.c:744
alloc_inode+0x64/0x190 fs/inode.c:210
iget5_locked fs/inode.c:1130 [inline]
iget5_locked+0x63/0xe0 fs/inode.c:1123
bdget+0x97/0x550 fs/block_dev.c:885
blkdev_get_by_dev+0x27/0x80 fs/block_dev.c:1746
lock_rdev+0xa0/0x160 drivers/md/md.c:2307
md_import_device+0x221/0x520 drivers/md/md.c:3488
add_new_disk+0x593/0x18c0 drivers/md/md.c:6347
md_ioctl+0x45d4/0x5980 drivers/md/md.c:7365
__blkdev_driver_ioctl block/ioctl.c:303 [inline]
blkdev_ioctl+0xc2c/0x1ab3 block/ioctl.c:601
block_ioctl+0xee/0x130 fs/block_dev.c:1894
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:688
ksys_ioctl+0xab/0xd0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:710
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 8126:
save_stack+0x45/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3503 [inline]
kmem_cache_free+0x86/0x260 mm/slab.c:3765
bdev_i_callback+0x20/0x30 fs/block_dev.c:755
__rcu_reclaim kernel/rcu/rcu.h:236 [inline]
rcu_do_batch kernel/rcu/tree.c:2584 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2864 [inline]
rcu_process_callbacks+0xba0/0x1a30 kernel/rcu/tree.c:2881
__do_softirq+0x25c/0x921 kernel/softirq.c:292
The buggy address belongs to the object at ffff888087fb1400
which belongs to the cache bdev_cache of size 1344
The buggy address is located 24 bytes inside of
1344-byte region [ffff888087fb1400, ffff888087fb1940)
The buggy address belongs to the page:
page:ffffea00021fec40 count:1 mapcount:0 mapping:ffff8880aa459540 index:0xffff888087fb1ffe
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffffea00021fd9c8 ffff8880aa2a8b48 ffff8880aa459540
raw: ffff888087fb1ffe ffff888087fb1400 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888087fb1300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888087fb1380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888087fb1400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888087fb1480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888087fb1500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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