linux-kernel - [PATCH v3] backlight: pm8941: Add NULL check in wled

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Message-Id: <20250401025737.16753-1-bsdhenrymartin@gmail.com>
Date: Tue,  1 Apr 2025 10:57:37 +0800
From: Henry Martin <bsdhenrymartin@...il.com>
To: lee@...nel.org,
	danielt@...nel.org,
	jingoohan1@...il.com,
	deller@....de
Cc: linux-arm-msm@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Henry Martin <bsdhenrymartin@...il.com>,
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Subject: [PATCH v3] backlight: pm8941: Add NULL check in wled_configure()

devm_kasprintf() returns NULL when memory allocation fails. Currently,
wled_configure() does not check for this case, which results in a NULL
pointer dereference.

Add NULL check after devm_kasprintf() to prevent this issue.

Fixes: f86b77583d88 ("backlight: pm8941: Convert to using %pOFn instead of device_node.name")
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Signed-off-by: Henry Martin <bsdhenrymartin@...il.com>
---
V2 -> V3: Correct commit meessage and confirm this patch has considered
resource cleanup to avoid any subsequent issues, ensuring that errors
are handled properly and no resources are left in an inconsistent
state.
V1 -> V2: Fix commit message to use imperative mood and wrap lines to 75
characters.

 drivers/video/backlight/qcom-wled.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
index 9afe701b2a1b..a63bb42c8f8b 100644
--- a/drivers/video/backlight/qcom-wled.c
+++ b/drivers/video/backlight/qcom-wled.c
@@ -1406,9 +1406,11 @@ static int wled_configure(struct wled *wled)
 	wled->ctrl_addr = be32_to_cpu(*prop_addr);
 
 	rc = of_property_read_string(dev->of_node, "label", &wled->name);
-	if (rc)
+	if (rc) {
 		wled->name = devm_kasprintf(dev, GFP_KERNEL, "%pOFn", dev->of_node);
-
+		if (!wled->name)
+			return -ENOMEM;
+	}
 	switch (wled->version) {
 	case 3:
 		u32_opts = wled3_opts;
-- 
2.34.1