netdev - [PATCH 1/4] batman-adv: don't pass a NULL hard_iface to batadv_hardif

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Message-Id: <20180524115325.15355-2-sw@simonwunderlich.de>
Date:   Thu, 24 May 2018 13:53:22 +0200
From:   Simon Wunderlich <sw@...onwunderlich.de>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, b.a.t.m.a.n@...ts.open-mesh.org,
        Colin Ian King <colin.king@...onical.com>,
        Sven Eckelmann <sven@...fation.org>,
        Simon Wunderlich <sw@...onwunderlich.de>
Subject: [PATCH 1/4] batman-adv: don't pass a NULL hard_iface to batadv_hardif_put

From: Colin Ian King <colin.king@...onical.com>

In the case where hard_iface is NULL, the error path may pass a null
pointer to batadv_hardif_put causing a null pointer dereference error.
Avoid this by only calling the function if  hard_iface not null.

Detected by CoverityScan, CID#1466456 ("Explicit null dereferenced")

Fixes: 53dd9a68ba68 ("batman-adv: add multicast flags netlink support")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Sven Eckelmann <sven@...fation.org>
Signed-off-by: Simon Wunderlich <sw@...onwunderlich.de>
---
 net/batman-adv/multicast.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
index a11d3d89f012..a35f597e8c8b 100644
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -1536,7 +1536,7 @@ batadv_mcast_netlink_get_primary(struct netlink_callback *cb,
 
 	if (!ret && primary_if)
 		*primary_if = hard_iface;
-	else
+	else if (hard_iface)
 		batadv_hardif_put(hard_iface);
 
 	return ret;
-- 
2.11.0