linux-kernel - [PATCH 5.9 48/75] dm: fix bug with RCU locking in dm_blk_report

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Date:   Thu, 10 Dec 2020 15:27:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sergei Shtepa <sergei.shtepa@...am.com>,
        Mike Snitzer <snitzer@...hat.com>
Subject: [PATCH 5.9 48/75] dm: fix bug with RCU locking in dm_blk_report_zones

From: Sergei Shtepa <sergei.shtepa@...am.com>

commit 89478335718c98557f10470a9bc5c555b9261c4e upstream.

The dm_get_live_table() function makes RCU read lock so
dm_put_live_table() must be called even if dm_table map is not found.

Fixes: e76239a3748c9 ("block: add a report_zones method")
Cc: stable@...r.kernel.org
Signed-off-by: Sergei Shtepa <sergei.shtepa@...am.com>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/dm.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -491,8 +491,10 @@ static int dm_blk_report_zones(struct ge
 		return -EAGAIN;
 
 	map = dm_get_live_table(md, &srcu_idx);
-	if (!map)
-		return -EIO;
+	if (!map) {
+		ret = -EIO;
+		goto out;
+	}
 
 	do {
 		struct dm_target *tgt;