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FAILED: patch "[PATCH] pinctrl: samsung: Fix device node refcount leaks in Exynos" failed to apply to 4.4-stable tree

PATCH [email protected] 1 participant 1 message Dec 15, 2019

Subsystems (4)
Stable branch Arm Samsung Exynos Pin control Pin controller - Samsung
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The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 5c7f48dd14e892e3e920dd6bbbd52df79e1b3b41 Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <[email protected]>
Date: Mon, 5 Aug 2019 18:27:07 +0200
Subject: [PATCH] pinctrl: samsung: Fix device node refcount leaks in Exynos
wakeup controller init

In exynos_eint_wkup_init() the for_each_child_of_node() loop is used with a break to find a matching child node. Although each iteration of for_each_child_of_node puts the previous node, but early exit from loop misses it. This leads to leak of device node.

Cc <[email protected]>
Fixes 43b169db1841 ("pinctrl: add exynos4210 specific extensions for samsung pinctrl driver")
Signed-off-by Krzysztof Kozlowski <[email protected]>
drivers/pinctrl/samsung/pinctrl-exynos.c +8 -2
index e7f4cbad2c92..0599f5127b01 100644
@@ -506,6 +506,7 @@ int exynos_eint_wkup_init(struct samsung_pinctrl_drv_data *d)
 				bank->nr_pins, &exynos_eint_irqd_ops, bank);
 		if (!bank->irq_domain) {
 			dev_err(dev, "wkup irq domain add failed\n");
+			of_node_put(wkup_np);
 			return -ENXIO;
 		}
 

@@ -520,8 +521,10 @@ int exynos_eint_wkup_init(struct samsung_pinctrl_drv_data *d)
 		weint_data = devm_kcalloc(dev,
 					  bank->nr_pins, sizeof(*weint_data),
 					  GFP_KERNEL);
-		if (!weint_data)
+		if (!weint_data) {
+			of_node_put(wkup_np);
 			return -ENOMEM;
+		}
 
 		for (idx = 0; idx < bank->nr_pins; ++idx) {
 			irq = irq_of_parse_and_map(bank->of_node, idx);

@@ -538,10 +541,13 @@ int exynos_eint_wkup_init(struct samsung_pinctrl_drv_data *d)
 		}
 	}
 
-	if (!muxed_banks)
+	if (!muxed_banks) {
+		of_node_put(wkup_np);
 		return 0;
+	}
 
 	irq = irq_of_parse_and_map(wkup_np, 0);
+	of_node_put(wkup_np);
 	if (!irq) {
 		dev_err(dev, "irq number for muxed EINTs not found\n");
 		return 0;