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Date: Tue, 16 Sep 2014 18:12:36 +0200 From: Mario Pirker <mariopirker@...mail.com> To: "mareklindner@...mailbox.ch" <mareklindner@...mailbox.ch>, "sw@...onwunderlich.de" <sw@...onwunderlich.de> CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: [PATCH] 3.17.0-rc5 - Add sanity check for NULL in batadv_gw_out_of_range >From b451e7317148e18bf6c5c8fd747d79ab34260354 Mon Sep 17 00:00:00 2001 From: Mario Pirker <mario.pirker@...logg.ox.ac.uk> Date: Tue, 16 Sep 2014 17:55:13 +0200 Subject: [PATCH] batman-adv: fix potential NULL pointer dereferencing 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@...mail.com) --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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