linux-kernel - [PATCH v4 4/6] dm: add add

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210927215958.1062466-5-mcgrof@kernel.org>
Date:   Mon, 27 Sep 2021 14:59:56 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     axboe@...nel.dk, martin.petersen@...cle.com, jejb@...ux.ibm.com,
        kbusch@...nel.org, sagi@...mberg.me, adrian.hunter@...el.com,
        beanhuo@...ron.com, ulf.hansson@...aro.org, avri.altman@....com,
        swboyd@...omium.org, agk@...hat.com, snitzer@...hat.com,
        josef@...icpanda.com
Cc:     hch@...radead.org, hare@...e.de, bvanassche@....org,
        ming.lei@...hat.com, linux-scsi@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-mmc@...r.kernel.org,
        dm-devel@...hat.com, nbd@...er.debian.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luis Chamberlain <mcgrof@...nel.org>
Subject: [PATCH v4 4/6] dm: add add_disk() error handling

We never checked for errors on add_disk() as this function
returned void. Now that this is fixed, use the shiny new
error handling.

There are two calls to dm_setup_md_queue() which can fail then,
one on dm_early_create() and we can easily see that the error path
there calls dm_destroy in the error path. The other use case is on
the ioctl table_load case. If that fails userspace needs to call
the DM_DEV_REMOVE_CMD to cleanup the state - similar to any other
failure.

Reviewed-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 drivers/md/dm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index a011d09cb0fa..b83aab8507c2 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2083,7 +2083,9 @@ int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t)
 	if (r)
 		return r;
 
-	add_disk(md->disk);
+	r = add_disk(md->disk);
+	if (r)
+		return r;
 
 	r = dm_sysfs_init(md);
 	if (r) {
-- 
2.30.2