[PATCH] batman-adv: fix potential NULL pointer dereferencing

[Mario Pirker]

The call batadv_gw_node_get may return NULL. The return value has to
be sanity checked before the pointer is dereferenced.

Signed-off-by: Mario Pirker (mariopirker@xxxxxxxxxxx)
---
 net/batman-adv/gateway_client.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c
index 90cff58..7ee0913 100644
--- a/net/batman-adv/gateway_client.c
+++ b/net/batman-adv/gateway_client.c
@@ -810,6 +810,11 @@ bool batadv_gw_out_of_range(struct batadv_priv *bat_priv,
                goto out;
 
        gw_node = batadv_gw_node_get(bat_priv, orig_dst_node);
+
+       /* gw_node can be NULL. We need to check before dereferencing */
+       if (gw_node == NULL)
+               goto out;
+
        if (!gw_node->bandwidth_down == 0)
                goto out;
 
-- 
1.8.1.4 		 	   		  --
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