linux-kernel - [PATCH] [DLM] Fix memory leak in dlm_add_member() when dlm_node

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Date:	Tue, 14 Aug 2007 10:47:08 +0100
From:	swhiteho@...hat.com
To:	linux-kernel@...r.kernel.org, cluster-devel@...hat.com
Cc:	Jesper Juhl <jesper.juhl@...il.com>,
	David Teigland <teigland@...hat.com>,
	Steven Whitehouse <swhiteho@...hat.com>
Subject: [PATCH] [DLM] Fix memory leak in dlm_add_member() when dlm_node_weight() returns less than zero

From: Jesper Juhl <jesper.juhl@...il.com>

There's a memory leak in fs/dlm/member.c::dlm_add_member().

If "dlm_node_weight(ls->ls_name, nodeid)" returns < 0, then
we'll return without freeing the memory allocated to the (at
that point yet unused) 'memb'.
This patch frees the allocated memory in that case and thus
avoids the leak.

Signed-off-by: Jesper Juhl <jesper.juhl@...il.com>
Signed-off-by: David Teigland <teigland@...hat.com>
Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>

diff --git a/fs/dlm/member.c b/fs/dlm/member.c
index 073599d..d099775 100644
--- a/fs/dlm/member.c
+++ b/fs/dlm/member.c
@@ -56,8 +56,10 @@ static int dlm_add_member(struct dlm_ls *ls, int nodeid)
 		return -ENOMEM;
 
 	w = dlm_node_weight(ls->ls_name, nodeid);
-	if (w < 0)
+	if (w < 0) {
+		kfree(memb);
 		return w;
+	}
 
 	memb->nodeid = nodeid;
 	memb->weight = w;
-- 
1.5.1.2

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