The bio->bi_iter.bi_size is updated when bio_add_page() is called. So we
do not need to assign msg->bi_size again to it, since its redudant and
can also be harmful. Instead we can use it to add a sanity check, which
checks the locally calculated bi_size, with the one sent in msg.
Signed-off-by: Md Haris Iqbal <haris.iqbal@xxxxxxxxx>
Signed-off-by: Jack Wang <jinpu.wang@xxxxxxxxx>
Signed-off-by: Grzegorz Prajsner <grzegorz.prajsner@xxxxxxxxx>
---
drivers/block/rnbd/rnbd-srv.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/block/rnbd/rnbd-srv.c b/drivers/block/rnbd/rnbd-srv.c
index f6e3a3c4b76c..08ce6d96d04c 100644
--- a/drivers/block/rnbd/rnbd-srv.c
+++ b/drivers/block/rnbd/rnbd-srv.c
@@ -149,15 +149,22 @@ static int process_rdma(struct rnbd_srv_session *srv_sess,
rnbd_to_bio_flags(le32_to_cpu(msg->rw)), GFP_KERNEL);
if (bio_add_page(bio, virt_to_page(data), datalen,
offset_in_page(data)) != datalen) {
- rnbd_srv_err(sess_dev, "Failed to map data to bio\n");
+ rnbd_srv_err_rl(sess_dev, "Failed to map data to bio\n");
err = -EINVAL;
goto bio_put;
}
+ bio->bi_opf = rnbd_to_bio_flags(le32_to_cpu(msg->rw));
+ if (bio_has_data(bio) &&
+ bio->bi_iter.bi_size != le32_to_cpu(msg->bi_size)) {
+ rnbd_srv_err_rl(sess_dev, "Datalen mismatch: bio bi_size (%u), bi_size (%u)\n",
+ bio->bi_iter.bi_size, msg->bi_size);
+ err = -EINVAL;
+ goto bio_put;
+ }
bio->bi_end_io = rnbd_dev_bi_end_io;
bio->bi_private = priv;
bio->bi_iter.bi_sector = le64_to_cpu(msg->sector);
- bio->bi_iter.bi_size = le32_to_cpu(msg->bi_size);
prio = srv_sess->ver < RNBD_PROTO_VER_MAJOR ||
usrlen < sizeof(*msg) ? 0 : le16_to_cpu(msg->prio);
bio_set_prio(bio, prio);
--
2.25.1
