diff options
| author | Li Nan <linan122@huawei.com> | 2025-11-03 15:57:54 +0300 |
|---|---|---|
| committer | Yu Kuai <yukuai@fnnas.com> | 2025-11-11 06:19:10 +0300 |
| commit | 381a3ce1c0ffed647c9b913e142b099c7e9d5afc (patch) | |
| tree | 6c26b1b7b64ed4bcb6b7a8e7c31a0ab9ee967539 /scripts/stackusage | |
| parent | 0ce112d9171ad766d4c6716951e73f91a0bfc184 (diff) | |
| download | linux-381a3ce1c0ffed647c9b913e142b099c7e9d5afc.tar.xz | |
md: init bioset in mddev_init
IO operations may be needed before md_run(), such as updating metadata
after writing sysfs. Without bioset, this triggers a NULL pointer
dereference as below:
BUG: kernel NULL pointer dereference, address: 0000000000000020
Call Trace:
md_update_sb+0x658/0xe00
new_level_store+0xc5/0x120
md_attr_store+0xc9/0x1e0
sysfs_kf_write+0x6f/0xa0
kernfs_fop_write_iter+0x141/0x2a0
vfs_write+0x1fc/0x5a0
ksys_write+0x79/0x180
__x64_sys_write+0x1d/0x30
x64_sys_call+0x2818/0x2880
do_syscall_64+0xa9/0x580
entry_SYSCALL_64_after_hwframe+0x4b/0x53
Reproducer
```
mdadm -CR /dev/md0 -l1 -n2 /dev/sd[cd]
echo inactive > /sys/block/md0/md/array_state
echo 10 > /sys/block/md0/md/new_level
```
mddev_init() can only be called once per mddev, no need to test if bioset
has been initialized anymore.
Link: https://lore.kernel.org/linux-raid/20251103125757.1405796-3-linan666@huaweicloud.com
Fixes: d981ed841930 ("md: Add new_level sysfs interface")
Signed-off-by: Li Nan <linan122@huawei.com>
Reviewed-by: Xiao Ni <xni@redhat.com>
Signed-off-by: Yu Kuai <yukuai@fnnas.com>
Diffstat (limited to 'scripts/stackusage')
0 files changed, 0 insertions, 0 deletions