Commit c347a787e34cb (drbd: set ->bi_bdev in drbd_req_new) moved a
bio_set_dev call (which has since been removed) to "earlier", from
drbd_request_prepare to drbd_req_new.
The problem is that this accesses device->ldev->backing_bdev, which is
not NULL-checked at this point. When we don't have an ldev (i.e. when
the DRBD device is diskless), this leads to a null pointer deref.
So, only allocate the private_bio if we actually have a disk. This is
also a small optimization, since we don't clone the bio to only to
immediately free it again in the diskless case.
Fixes: c347a787e34cb ("drbd: set ->bi_bdev in drbd_req_new")
Co-developed-by: Christoph Böhmwalder <christoph.boehmwalder@xxxxxxxxxx>
Signed-off-by: Christoph Böhmwalder <christoph.boehmwalder@xxxxxxxxxx>
Co-developed-by: Joel Colledge <joel.colledge@xxxxxxxxxx>
Signed-off-by: Joel Colledge <joel.colledge@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
Changes in v2:
- Fix an overly long line
---
drivers/block/drbd/drbd_req.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index 8f7f144e54f3..7f9bcc82fc9c 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -30,11 +30,6 @@ static struct drbd_request *drbd_req_new(struct drbd_device *device, struct bio
return NULL;
memset(req, 0, sizeof(*req));
- req->private_bio = bio_alloc_clone(device->ldev->backing_bdev, bio_src,
- GFP_NOIO, &drbd_io_bio_set);
- req->private_bio->bi_private = req;
- req->private_bio->bi_end_io = drbd_request_endio;
-
req->rq_state = (bio_data_dir(bio_src) == WRITE ? RQ_WRITE : 0)
| (bio_op(bio_src) == REQ_OP_WRITE_ZEROES ? RQ_ZEROES : 0)
| (bio_op(bio_src) == REQ_OP_DISCARD ? RQ_UNMAP : 0);
@@ -1219,9 +1214,12 @@ drbd_request_prepare(struct drbd_device *device, struct bio *bio)
/* Update disk stats */
req->start_jif = bio_start_io_acct(req->master_bio);
- if (!get_ldev(device)) {
- bio_put(req->private_bio);
- req->private_bio = NULL;
+ if (get_ldev(device)) {
+ req->private_bio = bio_alloc_clone(device->ldev->backing_bdev,
+ bio, GFP_NOIO,
+ &drbd_io_bio_set);
+ req->private_bio->bi_private = req;
+ req->private_bio->bi_end_io = drbd_request_endio;
}
/* process discards always from our submitter thread */
--
2.37.3
