From: Dinghao Liu <dinghao.liu@zju.edu.cn>
To: dinghao.liu@zju.edu.cn, kjlu@umn.edu
Cc: Heinz Mauelshagen <heinzm@redhat.com>,
dm-devel@redhat.com, Mike Snitzer <snitzer@redhat.com>,
Alasdair Kergon <agk@redhat.com>,
linux-kernel@vger.kernel.org
Subject: [dm-devel] [PATCH] dm raid: add missed unlock in raid_ctr
Date: Fri, 3 Sep 2021 15:55:30 +0800 [thread overview]
Message-ID: <20210903075531.20310-1-dinghao.liu@zju.edu.cn> (raw)
mddev_unlock() is called on all paths after we call mddev_lock_nointr(),
except for three error handling paths, which may cause a deadlock. This
bug is suggested by a static analysis tool, please advise.
Fixes: 9dbd1aa3a81c ("dm raid: add reshaping support to the target")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
---
drivers/md/dm-raid.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index d9ef52159a22..79f36a806082 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -3276,15 +3276,19 @@ static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv)
/* Try to adjust the raid4/5/6 stripe cache size to the stripe size */
if (rs_is_raid456(rs)) {
r = rs_set_raid456_stripe_cache(rs);
- if (r)
+ if (r) {
+ mddev_unlock(&rs->md);
goto bad_stripe_cache;
+ }
}
/* Now do an early reshape check */
if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
r = rs_check_reshape(rs);
- if (r)
+ if (r) {
+ mddev_unlock(&rs->md);
goto bad_check_reshape;
+ }
/* Restore new, ctr requested layout to perform check */
rs_config_restore(rs, &rs_layout);
@@ -3293,6 +3297,7 @@ static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv)
r = rs->md.pers->check_reshape(&rs->md);
if (r) {
ti->error = "Reshape check failed";
+ mddev_unlock(&rs->md);
goto bad_check_reshape;
}
}
--
2.17.1
--
dm-devel mailing list
dm-devel@redhat.com
https://listman.redhat.com/mailman/listinfo/dm-devel
next reply other threads:[~2021-09-06 8:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-03 7:55 Dinghao Liu [this message]
2021-09-03 13:30 ` [dm-devel] [PATCH] dm raid: add missed unlock in raid_ctr Heinz Mauelshagen
2021-09-06 2:14 ` dinghao.liu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210903075531.20310-1-dinghao.liu@zju.edu.cn \
--to=dinghao.liu@zju.edu.cn \
--cc=agk@redhat.com \
--cc=dm-devel@redhat.com \
--cc=heinzm@redhat.com \
--cc=kjlu@umn.edu \
--cc=linux-kernel@vger.kernel.org \
--cc=snitzer@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).