crypto: ixp4xx - fix OF node reference leaks in init_ixp_crypto()

init_ixp_crypto() calls of_parse_phandle_with_fixed_args() multiple
times, but does not release all the obtained refcounts. Fix it by adding
of_node_put() calls.

This bug was found by an experimental static analysis tool that I am
developing.

Fixes: 76f24b4 ("crypto: ixp4xx - Add device tree support")
Signed-off-by: Joe Hattori <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>

Author: joehattori

drivers/crypto/intel/ixp4xx/ixp4xx_crypto.c

@@ -471,6 +471,7 @@ static int init_ixp_crypto(struct device *dev)
 			return -ENODEV;
 		}
 		npe_id = npe_spec.args[0];
+		of_node_put(npe_spec.np);
 
 		ret = of_parse_phandle_with_fixed_args(np, "queue-rx", 1, 0,
 						       &queue_spec);
@@ -479,6 +480,7 @@ static int init_ixp_crypto(struct device *dev)
 			return -ENODEV;
 		}
 		recv_qid = queue_spec.args[0];
+		of_node_put(queue_spec.np);
 
 		ret = of_parse_phandle_with_fixed_args(np, "queue-txready", 1, 0,
 						       &queue_spec);
@@ -487,6 +489,7 @@ static int init_ixp_crypto(struct device *dev)
 			return -ENODEV;
 		}
 		send_qid = queue_spec.args[0];
+		of_node_put(queue_spec.np);
 	} else {
 		/*
 		 * Hardcoded engine when using platform data, this goes away