linux-kernel - [PATCH 3.13 068/172] batman-adv: fix potential orig

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Date:	Tue,  4 Mar 2014 12:02:32 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Antonio Quartulli <antonio@...hcoding.com>,
	Simon Wunderlich <sw@...onwunderlich.de>,
	Marek Lindner <mareklindner@...mailbox.ch>
Subject: [PATCH 3.13 068/172] batman-adv: fix potential orig_node reference leak

3.13-stable review patch.  If anyone has any objections, please let me know.

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

From: Simon Wunderlich <sw@...onwunderlich.de>

[ Upstream commit b2262df7fcf2c395eca564df83238e931d88d7bf ]

Since batadv_orig_node_new() sets the refcount to two, assuming that
the calling function will use a reference for putting the orig_node into
a hash or similar, both references must be freed if initialization of
the orig_node fails. Otherwise that object may be leaked in that error
case.

Reported-by: Antonio Quartulli <antonio@...hcoding.com>
Signed-off-by: Simon Wunderlich <sw@...onwunderlich.de>
Signed-off-by: Marek Lindner <mareklindner@...mailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@...hcoding.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/batman-adv/bat_iv_ogm.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c
@@ -256,6 +256,8 @@ batadv_iv_ogm_orig_get(struct batadv_pri
 free_bcast_own:
 	kfree(orig_node->bat_iv.bcast_own);
 free_orig_node:
+	/* free twice, as batadv_orig_node_new sets refcount to 2 */
+	batadv_orig_node_free_ref(orig_node);
 	batadv_orig_node_free_ref(orig_node);
 
 	return NULL;


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