linux-kernel - [2.6.24 PATCH 01/25] dm mpath: rdac fix init race

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>] [day] [month] [year] [list]

Message-ID: <20071012170434.GL24157@agk.fab.redhat.com>
Date:	Fri, 12 Oct 2007 18:04:34 +0100
From:	Alasdair G Kergon <agk@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	dm-devel@...hat.com, linux-kernel@...r.kernel.org,
	"Bryn M. Reeves" <breeves@...hat.com>
Subject: [2.6.24 PATCH 01/25] dm mpath: rdac fix init race

From: Bryn M. Reeves <breeves@...hat.com>

Re-order the initialisation of dm-rdac to avoid registering the hw
handler before the workqueue has been initialised. Closes a race
that would potentially give an oops.

Signed-off-by: Bryn M. Reeves <breeves@...hat.com>
Signed-off-by: Alasdair G Kergon <agk@...hat.com>

---
 drivers/md/dm-mpath-rdac.c |   15 ++++++++-------
 1 files changed, 8 insertions(+), 7 deletions(-)

Index: linux-2.6.23/drivers/md/dm-mpath-rdac.c
===================================================================
--- linux-2.6.23.orig/drivers/md/dm-mpath-rdac.c	2007-10-12 13:15:23.000000000 +0100
+++ linux-2.6.23/drivers/md/dm-mpath-rdac.c	2007-10-12 13:15:24.000000000 +0100
@@ -664,20 +664,21 @@ static struct hw_handler_type rdac_handl
 
 static int __init rdac_init(void)
 {
-	int r = dm_register_hw_handler(&rdac_handler);
-
-	if (r < 0) {
-		DMERR("%s: register failed %d", RDAC_DM_HWH_NAME, r);
-		return r;
-	}
+	int r;
 
 	rdac_wkqd = create_singlethread_workqueue("rdac_wkqd");
 	if (!rdac_wkqd) {
 		DMERR("Failed to create workqueue rdac_wkqd.");
-		dm_unregister_hw_handler(&rdac_handler);
 		return -ENOMEM;
 	}
 
+	r = dm_register_hw_handler(&rdac_handler);
+	if (r < 0) {
+		DMERR("%s: register failed %d", RDAC_DM_HWH_NAME, r);
+		destroy_workqueue(rdac_wkqd);
+		return r;
+	}
+
 	DMINFO("%s: version %s loaded", RDAC_DM_HWH_NAME, RDAC_DM_HWH_VER);
 	return 0;
 }
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/