linux-kernel - [PATCH] Fix possible NULL Pointer Dereference in 'extcon_rtk_type_c

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Message-Id: <20240929223813.21164-1-zichenxie0106@gmail.com>
Date: Sun, 29 Sep 2024 17:38:13 -0500
From: Gax-c <zichenxie0106@...il.com>
To: myungjoo.ham@...sung.com,
	cw00.choi@...sung.com,
	stanley_chang@...ltek.com
Cc: linux-kernel@...r.kernel.org,
	Gax-c <zichenxie0106@...il.com>,
	Zijie Zhao <zzjas98@...il.com>,
	Chenyuan Yang <chenyuan0y@...il.com>
Subject: [PATCH] Fix possible NULL Pointer Dereference in 'extcon_rtk_type_c_probe'

A 'devm_kzalloc' in 'extcon_rtk_type_c_probe' could possibly return null pointer.
Add a null check for the returned pointer.

Fixes: 8a590d7371f0 ("extcon: add Realtek DHC RTD SoC Type-C driver")
Signed-off-by: Zichen Xie <zichenxie0106@...il.com>
Reported-by: Zichen Xie <zichenxie0106@...il.com>
Reported-by: Zijie Zhao <zzjas98@...il.com>
Reported-by: Chenyuan Yang <chenyuan0y@...il.com>
---
 drivers/extcon/extcon-rtk-type-c.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/extcon/extcon-rtk-type-c.c b/drivers/extcon/extcon-rtk-type-c.c
index a592bab77538..9a0824fc7cbe 100644
--- a/drivers/extcon/extcon-rtk-type-c.c
+++ b/drivers/extcon/extcon-rtk-type-c.c
@@ -1371,6 +1371,12 @@ static int extcon_rtk_type_c_probe(struct platform_device *pdev)
 
 	type_c->type_c_cfg = devm_kzalloc(dev, sizeof(*type_c_cfg), GFP_KERNEL);
 
+	if (!type_c->type_c_cfg) {
+		dev_err(dev, "Failed to allocate memory for type_c_cfg!\n");
+		ret = -ENOMEM;
+		goto err;
+	}
+
 	memcpy(type_c->type_c_cfg, type_c_cfg, sizeof(*type_c_cfg));
 
 	if (setup_type_c_parameter(type_c)) {
-- 
2.25.1