linux-kernel - [patch 110/108] dm exception store: really fix type lookup

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Date:	Wed, 1 Jul 2009 11:13:23 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk
Cc:	Milan Broz <mbroz@...hat.com>, Yi Yang <yi.y.yang@...el.com>,
	Jonathan Brassow <jbrassow@...hat.com>,
	Alasdair G Kergon <agk@...hat.com>
Subject: [patch 110/108] dm exception store: really fix type lookup

2.6.30-stable review patch

---------------------

From: Milan Broz <mbroz@...hat.com>

commit 874d2f61d31e596c36af7732dc1b3aa2dc233824 upstream.

Fix exception store name handling.

We need to reference exception store by zero terminated string.

Fixes regression introduced in commit f6bd4eb73cdf2a5bf954e497972842f39cabb7e3

Cc: Yi Yang <yi.y.yang@...el.com>
Cc: Jonathan Brassow <jbrassow@...hat.com>
Cc: stable@...nel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Milan Broz <mbroz@...hat.com>
Signed-off-by: Alasdair G Kergon <agk@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/md/dm-exception-store.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/drivers/md/dm-exception-store.c
+++ b/drivers/md/dm-exception-store.c
@@ -195,7 +195,7 @@ int dm_exception_store_create(struct dm_
 			      struct dm_exception_store **store)
 {
 	int r = 0;
-	struct dm_exception_store_type *type;
+	struct dm_exception_store_type *type = NULL;
 	struct dm_exception_store *tmp_store;
 	char persistent;
 
@@ -211,12 +211,15 @@ int dm_exception_store_create(struct dm_
 	}
 
 	persistent = toupper(*argv[1]);
-	if (persistent != 'P' && persistent != 'N') {
+	if (persistent == 'P')
+		type = get_type("P");
+	else if (persistent == 'N')
+		type = get_type("N");
+	else {
 		ti->error = "Persistent flag is not P or N";
 		return -EINVAL;
 	}
 
-	type = get_type(&persistent);
 	if (!type) {
 		ti->error = "Exception store type not recognised";
 		r = -EINVAL;
--
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