From: Yu Kuai yukuai3@huawei.com
hulk inclusion category: bugfix bugzilla: 187345, https://gitee.com/openeuler/kernel/issues/I5L5ZG CVE: NA
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Otherwise, null pointer crash can be triggered to handle bio in blk_mq_submit_bio() while queue is not initialized.
Signed-off-by: Yu Kuai yukuai3@huawei.com Reviewed-by: Jason Yan yanaijie@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/md/dm.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index b97defbe21bb..335eef5c3c05 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -2149,12 +2149,16 @@ int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t)
switch (type) { case DM_TYPE_REQUEST_BASED: - md->disk->fops = &dm_rq_blk_dops; r = dm_mq_init_request_queue(md, t); if (r) { DMERR("Cannot initialize queue for request-based dm mapped device"); return r; } + /* + * Change the fops after queue is initialized, so that bio won't + * issued by rq-based path until that. + */ + md->disk->fops = &dm_rq_blk_dops; break; case DM_TYPE_BIO_BASED: case DM_TYPE_DAX_BIO_BASED: