[PATCH 5.12 204/363] block/rnbd-clt: Check the return value of the function rtrs_clt_query

[Greg Kroah-Hartman]

From: Md Haris Iqbal <haris.iqbal@xxxxxxxxxxxxxxx>

[ Upstream commit 1056ad829ec43f9b705b507c2093b05e2088b0b7 ]

In case none of the paths are in connected state, the function
rtrs_clt_query returns an error. In such a case, error out since the
values in the rtrs_attrs structure would be garbage.

Fixes: f7a7a5c228d45 ("block/rnbd: client: main functionality")
Signed-off-by: Md Haris Iqbal <haris.iqbal@xxxxxxxxx>
Reviewed-by: Guoqing Jiang <guoqing.jiang@xxxxxxxxx>
Signed-off-by: Jack Wang <jinpu.wang@xxxxxxxxx>
Signed-off-by: Gioh Kim <gi-oh.kim@xxxxxxxxx>
Link: https://lore.kernel.org/r/20210428061359.206794-4-gi-oh.kim@xxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/block/rnbd/rnbd-clt.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/block/rnbd/rnbd-clt.c b/drivers/block/rnbd/rnbd-clt.c
index 45a470076652..5ab7319ff2ea 100644
--- a/drivers/block/rnbd/rnbd-clt.c
+++ b/drivers/block/rnbd/rnbd-clt.c
@@ -693,7 +693,11 @@ static void remap_devs(struct rnbd_clt_session *sess)
 		return;
 	}
 
-	rtrs_clt_query(sess->rtrs, &attrs);
+	err = rtrs_clt_query(sess->rtrs, &attrs);
+	if (err) {
+		pr_err("rtrs_clt_query(\"%s\"): %d\n", sess->sessname, err);
+		return;
+	}
 	mutex_lock(&sess->lock);
 	sess->max_io_size = attrs.max_io_size;
 
@@ -1234,7 +1238,11 @@ find_and_get_or_create_sess(const char *sessname,
 		err = PTR_ERR(sess->rtrs);
 		goto wake_up_and_put;
 	}
-	rtrs_clt_query(sess->rtrs, &attrs);
+
+	err = rtrs_clt_query(sess->rtrs, &attrs);
+	if (err)
+		goto close_rtrs;
+
 	sess->max_io_size = attrs.max_io_size;
 	sess->queue_depth = attrs.queue_depth;
 
-- 
2.30.2