[PATCH 3.14 132/140] batman-adv: fix indirect hard_iface NULL dereference

[Greg Kroah-Hartman]

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

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

From: Marek Lindner <mareklindner@xxxxxxxxxxxxx>

[ Upstream commit 16a4142363b11952d3aa76ac78004502c0c2fe6e ]

If hard_iface is NULL and goto out is made batadv_hardif_free_ref()
doesn't check for NULL before dereferencing it to get to refcount.

Introduced in cb1c92ec37fb70543d133a1fa7d9b54d6f8a1ecd
("batman-adv: add debugfs support to view multiif tables").

Reported-by: Sven Eckelmann <sven@xxxxxxxxxxxxx>
Signed-off-by: Marek Lindner <mareklindner@xxxxxxxxxxxxx>
Acked-by: Antonio Quartulli <antonio@xxxxxxxxxxxxxx>
Signed-off-by: Antonio Quartulli <antonio@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/batman-adv/originator.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -1074,7 +1074,8 @@ int batadv_orig_hardif_seq_print_text(st
 	bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq, hard_iface);
 
 out:
-	batadv_hardif_free_ref(hard_iface);
+	if (hard_iface)
+		batadv_hardif_free_ref(hard_iface);
 	return 0;
 }
 


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