memory: samsung: exynos5422-dmc: Fix refcount leak in of_get_dram_timings

stable inclusion
from stable-v5.10.127
commit 889aad2203e09eed2071ca8985c25e9d6aea5735
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5XDDK

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=889aad2203e09eed2071ca8985c25e9d6aea5735

--------------------------------

commit 1332661e upstream.

of_parse_phandle() returns a node pointer with refcount
incremented, we should use of_node_put() on it when not need anymore.
This function doesn't call of_node_put() in some error paths.
To unify the structure, Add put_node label and goto it on errors.

Fixes: 6e7674c3 ("memory: Add DMC driver for Exynos5422")
Signed-off-by: NMiaoqian Lin <linmq006@gmail.com>
Reviewed-by: NLukasz Luba <lukasz.luba@arm.com>
Link: https://lore.kernel.org/r/20220602041721.64348-1-linmq006@gmail.comSigned-off-by: NKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>

drivers/memory/samsung/exynos5422-dmc.c

@@ -1192,33 +1192,39 @@ static int of_get_dram_timings(struct exynos5_dmc *dmc)
 
 	dmc->timing_row = devm_kmalloc_array(dmc->dev, TIMING_COUNT,
 					     sizeof(u32), GFP_KERNEL);
-	if (!dmc->timing_row)
-		return -ENOMEM;
+	if (!dmc->timing_row) {
+		ret = -ENOMEM;
+		goto put_node;
+	}
 
 	dmc->timing_data = devm_kmalloc_array(dmc->dev, TIMING_COUNT,
 					      sizeof(u32), GFP_KERNEL);
-	if (!dmc->timing_data)
-		return -ENOMEM;
+	if (!dmc->timing_data) {
+		ret = -ENOMEM;
+		goto put_node;
+	}
 
 	dmc->timing_power = devm_kmalloc_array(dmc->dev, TIMING_COUNT,
 					       sizeof(u32), GFP_KERNEL);
-	if (!dmc->timing_power)
-		return -ENOMEM;
+	if (!dmc->timing_power) {
+		ret = -ENOMEM;
+		goto put_node;
+	}
 
 	dmc->timings = of_lpddr3_get_ddr_timings(np_ddr, dmc->dev,
 						 DDR_TYPE_LPDDR3,
 						 &dmc->timings_arr_size);
 	if (!dmc->timings) {
-		of_node_put(np_ddr);
 		dev_warn(dmc->dev, "could not get timings from DT\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto put_node;
 	}
 
 	dmc->min_tck = of_lpddr3_get_min_tck(np_ddr, dmc->dev);
 	if (!dmc->min_tck) {
-		of_node_put(np_ddr);
 		dev_warn(dmc->dev, "could not get tck from DT\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto put_node;
 	}
 
 	/* Sorted array of OPPs with frequency ascending */
@@ -1232,13 +1238,14 @@ static int of_get_dram_timings(struct exynos5_dmc *dmc)
 					     clk_period_ps);
 	}
 
-	of_node_put(np_ddr);
 
 	/* Take the highest frequency's timings as 'bypass' */
 	dmc->bypass_timing_row = dmc->timing_row[idx - 1];
 	dmc->bypass_timing_data = dmc->timing_data[idx - 1];
 	dmc->bypass_timing_power = dmc->timing_power[idx - 1];
 
+put_node:
+	of_node_put(np_ddr);
 	return ret;
 }