linux-kernel - [PATCH] Fix memory leak in dm_create_persistent() when starting metadata update thread fails.

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Date:	Mon, 16 Jul 2007 21:41:43 +0200
From:	Jesper Juhl <jesper.juhl@...il.com>
To:	dm-devel@...hat.com
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alasdair G Kergon <agk@...hat.com>,
	Jesper Juhl <jesper.juhl@...il.com>
Subject: [PATCH] Fix memory leak in dm_create_persistent() when starting metadata update thread fails.

If, in dm_create_persistent(), the call to 
create_singlethread_workqueue() fails then we'll return without 
freeing the memory allocated to 'ps', thus leaking 
sizeof(struct pstore) bytes.
This patch fixes the leak.

Signed-off-by: Jesper Juhl <jesper.juhl@...il.com
---

diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c
index 3d65917..8fe81e1 100644
--- a/drivers/md/dm-exception-store.c
+++ b/drivers/md/dm-exception-store.c
@@ -623,6 +623,7 @@ int dm_create_persistent(struct exception_store *store)
 
 	ps->metadata_wq = create_singlethread_workqueue("ksnaphd");
 	if (!ps->metadata_wq) {
+		kfree(ps);
 		DMERR("couldn't start header metadata update thread");
 		return -ENOMEM;
 	}


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