linux-kernel - [PATCH] rds: prevent dereference of a NULL device in rds_iw_laddr

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Message-Id: <1387581520-10272-1-git-send-email-sasha.levin@oracle.com>
Date:	Fri, 20 Dec 2013 18:18:40 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	venkat.x.venkatsubra@...cle.com, davem@...emloft.net
Cc:	rds-devel@....oracle.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Sasha Levin <sasha.levin@...cle.com>
Subject: [PATCH] rds: prevent dereference of a NULL device in rds_iw_laddr_check

Binding might result in a NULL device which is later dereferenced
without checking.

Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
---
 net/rds/iw.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/rds/iw.c b/net/rds/iw.c
index 7826d46..0298920 100644
--- a/net/rds/iw.c
+++ b/net/rds/iw.c
@@ -239,7 +239,8 @@ static int rds_iw_laddr_check(__be32 addr)
 	ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
 	/* due to this, we will claim to support IB devices unless we
 	   check node_type. */
-	if (ret || cm_id->device->node_type != RDMA_NODE_RNIC)
+	if (ret || !cm_id->device ||
+            cm_id->device->node_type != RDMA_NODE_RNIC)
 		ret = -EADDRNOTAVAIL;
 
 	rdsdebug("addr %pI4 ret %d node type %d\n",
-- 
1.8.3.2

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