diff options
| author | Li Nan <linan122@huawei.com> | 2024-09-04 05:13:48 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2024-09-04 15:15:38 +0200 |
| commit | e58f5142f88320a5b1449f96a146f2f24615c5c7 (patch) | |
| tree | 0f3b7e5a17475b8243a7919e171da61dc9513869 /drivers/block | |
| parent | block: fix detection of unsupported WRITE SAME in blkdev_issue_write_zeroes (diff) | |
| download | linux-e58f5142f88320a5b1449f96a146f2f24615c5c7.tar.xz linux-e58f5142f88320a5b1449f96a146f2f24615c5c7.zip | |
ublk_drv: fix NULL pointer dereference in ublk_ctrl_start_recovery()
When two UBLK_CMD_START_USER_RECOVERY commands are submitted, the
first one sets 'ubq->ubq_daemon' to NULL, and the second one triggers
WARN in ublk_queue_reinit() and subsequently a NULL pointer dereference
issue.
Fix it by adding the check in ublk_ctrl_start_recovery() and return
immediately in case of zero 'ub->nr_queues_ready'.
BUG: kernel NULL pointer dereference, address: 0000000000000028
RIP: 0010:ublk_ctrl_start_recovery.constprop.0+0x82/0x180
Call Trace:
<TASK>
? __die+0x20/0x70
? page_fault_oops+0x75/0x170
? exc_page_fault+0x64/0x140
? asm_exc_page_fault+0x22/0x30
? ublk_ctrl_start_recovery.constprop.0+0x82/0x180
ublk_ctrl_uring_cmd+0x4f7/0x6c0
? pick_next_task_idle+0x26/0x40
io_uring_cmd+0x9a/0x1b0
io_issue_sqe+0x193/0x3f0
io_wq_submit_work+0x9b/0x390
io_worker_handle_work+0x165/0x360
io_wq_worker+0xcb/0x2f0
? finish_task_switch.isra.0+0x203/0x290
? finish_task_switch.isra.0+0x203/0x290
? __pfx_io_wq_worker+0x10/0x10
ret_from_fork+0x2d/0x50
? __pfx_io_wq_worker+0x10/0x10
ret_from_fork_asm+0x1a/0x30
</TASK>
Fixes: c732a852b419 ("ublk_drv: add START_USER_RECOVERY and END_USER_RECOVERY support")
Reported-and-tested-by: Changhui Zhong <czhong@redhat.com>
Closes: https://lore.kernel.org/all/CAGVVp+UvLiS+bhNXV-h2icwX1dyybbYHeQUuH7RYqUvMQf6N3w@mail.gmail.com
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Li Nan <linan122@huawei.com>
Link: https://lore.kernel.org/r/20240904031348.4139545-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/ublk_drv.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index 890c08792ba8..1d53a3f48a0e 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -2663,6 +2663,8 @@ static int ublk_ctrl_start_recovery(struct ublk_device *ub, mutex_lock(&ub->mutex); if (!ublk_can_use_recovery(ub)) goto out_unlock; + if (!ub->nr_queues_ready) + goto out_unlock; /* * START_RECOVERY is only allowd after: * |