Commit 89478335 authored Nov 11, 2020 by Sergei Shtepa Committed by Mike Snitzer Dec 01, 2020

dm: fix bug with RCU locking in dm_blk_report_zones



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: e76239a3 ("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>

parent 35d2835d

drivers/md/dm.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -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;

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