[PATCH] RDS: verify the underlying transport exists before creating a connection

[Sasha Levin]

There was no verification that an underlying transport exists when creating
a connection, this would cause dereferencing a NULL ptr.

Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
 net/rds/connection.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/rds/connection.c b/net/rds/connection.c
index a50e652..0218d81 100644
--- a/net/rds/connection.c
+++ b/net/rds/connection.c
@@ -189,6 +189,12 @@ new_conn:
 		}
 	}
 
+	if (trans == NULL) {
+		kmem_cache_free(rds_conn_slab, conn);
+		conn = ERR_PTR(-ENODEV);
+		goto out;
+	}
+
 	conn->c_trans = trans;
 
 	ret = trans->conn_alloc(conn, gfp);
-- 
1.7.10.4

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