linux-kernel - [PATCH] Bluetooth: btrtl: Prevent potential NULL dereference

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Message-ID: <0174d93d-f3a5-48ed-a755-ed7f6455c1bf@stanley.mountain>
Date: Wed, 2 Apr 2025 14:01:41 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: Marcel Holtmann <marcel@...tmann.org>,
	Luiz Augusto von Dentz <luiz.dentz@...il.com>,
	Jeremy Cline <jeremy@...ine.org>,
	Hans de Goede <hdegoede@...hat.com>,
	linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] Bluetooth: btrtl: Prevent potential NULL dereference

The btrtl_initialize() function checks that rtl_load_file() either
had an error or it loaded a zero length file.  However, if it loaded
a zero length file then the error code is not set correctly.  It
results in an error pointer vs NULL bug, followed by a NULL pointer
dereference.  This was detected by Smatch:

drivers/bluetooth/btrtl.c:592 btrtl_initialize() warn: passing zero to 'ERR_PTR'

Fixes: 26503ad25de8 ("Bluetooth: btrtl: split the device initialization into smaller parts")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/bluetooth/btrtl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c
index d3eba0d4a57d..7838c89e529e 100644
--- a/drivers/bluetooth/btrtl.c
+++ b/drivers/bluetooth/btrtl.c
@@ -1215,6 +1215,8 @@ struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,
 			rtl_dev_err(hdev, "mandatory config file %s not found",
 				    btrtl_dev->ic_info->cfg_name);
 			ret = btrtl_dev->cfg_len;
+			if (!ret)
+				ret = -EINVAL;
 			goto err_free;
 		}
 	}
-- 
2.47.2