linux-kernel - [PATCH] pinctrl: berlin: fix memory leak in berlin_pinctrl_build

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Message-Id: <20250620015343.21494-1-chenyuan_fl@163.com>
Date: Fri, 20 Jun 2025 09:53:43 +0800
From: Yuan Chen <chenyuan_fl@....com>
To: linus.walleij@...aro.org
Cc: linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	chenyuan_fl@....com,
	Yuan Chen <chenyuan@...inos.cn>
Subject: [PATCH] pinctrl: berlin: fix memory leak in berlin_pinctrl_build_state()

From: Yuan Chen <chenyuan@...inos.cn>

In the original implementation, krealloc() failure handling incorrectly
assigned the original memory pointer to NULL after kfree(), causing a
memory leak when reallocation failed.

Fixes: de845036f997 ("pinctrl: berlin: fix error return code of berlin_pinctrl_build_state()")
Signed-off-by: Yuan Chen <chenyuan@...inos.cn>
---
 drivers/pinctrl/berlin/berlin.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/berlin/berlin.c b/drivers/pinctrl/berlin/berlin.c
index c372a2a24be4..9dc2da8056b7 100644
--- a/drivers/pinctrl/berlin/berlin.c
+++ b/drivers/pinctrl/berlin/berlin.c
@@ -204,6 +204,7 @@ static int berlin_pinctrl_build_state(struct platform_device *pdev)
 	const struct berlin_desc_group *desc_group;
 	const struct berlin_desc_function *desc_function;
 	int i, max_functions = 0;
+	struct pinfunction *new_functions;
 
 	pctrl->nfunctions = 0;
 
@@ -229,12 +230,15 @@ static int berlin_pinctrl_build_state(struct platform_device *pdev)
 		}
 	}
 
-	pctrl->functions = krealloc(pctrl->functions,
+	new_functions = krealloc(pctrl->functions,
 				    pctrl->nfunctions * sizeof(*pctrl->functions),
 				    GFP_KERNEL);
-	if (!pctrl->functions)
+	if (!new_functions) {
+		kfree(pctrl->functions);
 		return -ENOMEM;
+	}
 
+	pctrl->functions = new_functions;
 	/* map functions to theirs groups */
 	for (i = 0; i < pctrl->desc->ngroups; i++) {
 		desc_group = pctrl->desc->groups + i;
-- 
2.25.1