[PATCH] clk: versatile: clk-icst: Fix node reference leak in of_syscon_icst_setup()

[Wentao Liang]

of_get_parent() takes a reference on the syscon parent node. The
reference is intentionally kept on the success path, but the error paths
return without dropping it, leaking the node reference. Release the
reference before returning on the error paths.

Fixes: d430819d69a5 ("clk: versatile-icst: add device tree support")
Cc: stable at vger.kernel.org
Signed-off-by: Wentao Liang <vulab at iscas.ac.cn>
---
 drivers/clk/versatile/clk-icst.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/clk/versatile/clk-icst.c b/drivers/clk/versatile/clk-icst.c
index 6bd3db54dd22..8c84377f3ec1 100644
--- a/drivers/clk/versatile/clk-icst.c
+++ b/drivers/clk/versatile/clk-icst.c
@@ -516,16 +516,19 @@ static void __init of_syscon_icst_setup(struct device_node *np)
 	map = syscon_node_to_regmap(parent);
 	if (IS_ERR(map)) {
 		pr_err("no regmap for syscon ICST clock parent\n");
+		of_node_put(parent);
 		return;
 	}
 
 	if (of_property_read_u32(np, "reg", &icst_desc.vco_offset) &&
 	    of_property_read_u32(np, "vco-offset", &icst_desc.vco_offset)) {
 		pr_err("no VCO register offset for ICST clock\n");
+		of_node_put(parent);
 		return;
 	}
 	if (of_property_read_u32(np, "lock-offset", &icst_desc.lock_offset)) {
 		pr_err("no lock register offset for ICST clock\n");
+		of_node_put(parent);
 		return;
 	}
 
@@ -552,6 +555,7 @@ static void __init of_syscon_icst_setup(struct device_node *np)
 		ctype = ICST_INTEGRATOR_CP_CM_MEM;
 	} else {
 		pr_err("unknown ICST clock %pOF\n", np);
+		of_node_put(parent);
 		return;
 	}
 
-- 
2.34.1