linux-kernel - [PATCH v3] HID: uclogic: Add NULL check in uclogic_input

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Message-Id: <20250401094853.24143-1-bsdhenrymartin@gmail.com>
Date: Tue,  1 Apr 2025 17:48:53 +0800
From: Henry Martin <bsdhenrymartin@...il.com>
To: Markus.Elfring@....de
Cc: jikos@...nel.org,
	bentiss@...nel.org,
	linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Henry Martin <bsdhenrymartin@...il.com>
Subject: [PATCH v3] HID: uclogic: Add NULL check in uclogic_input_configured()

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

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

Fixes: dd613a4e45f8 ("HID: uclogic: Correct devm device reference for hidinput input_dev name")
Signed-off-by: Henry Martin <bsdhenrymartin@...il.com>
---
V2 -> V3: Kept the original switch structure, only optimized the outer
conditional checks while maintaining safety requirements.
V1 -> V2: Simplify the handing of the condition "suffix" with if/else.

 drivers/hid/hid-uclogic-core.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/hid/hid-uclogic-core.c b/drivers/hid/hid-uclogic-core.c
index d8008933c052..321c43fb06ae 100644
--- a/drivers/hid/hid-uclogic-core.c
+++ b/drivers/hid/hid-uclogic-core.c
@@ -142,11 +142,12 @@ static int uclogic_input_configured(struct hid_device *hdev,
 			suffix = "System Control";
 			break;
 		}
-	}
-
-	if (suffix)
+	} else {
 		hi->input->name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
 						 "%s %s", hdev->name, suffix);
+		if (!hi->input->name)
+			return -ENOMEM;
+	}
 
 	return 0;
 }
-- 
2.34.1