From 89478335718c98557f10470a9bc5c555b9261c4e Mon Sep 17 00:00:00 2001
From: Sergei Shtepa <sergei.shtepa@veeam.com>
Date: Wed, 11 Nov 2020 15:55:46 +0300
Subject: [PATCH] dm: fix bug with RCU locking in dm_blk_report_zones
Git-commit: 89478335718c98557f10470a9bc5c555b9261c4e
Patch-mainline: v5.10-rc7
References: git-fixes
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@vger.kernel.org
Signed-off-by: Sergei Shtepa <sergei.shtepa@veeam.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Coly Li <colyli@suse.de>
---
drivers/md/dm.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index c18fc2548518..98866e725f25 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -476,8 +476,10 @@ static int dm_blk_report_zones(struct gendisk *disk, sector_t sector,
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;
--
2.26.2