linux-kernel - [PATCH 5.10.y] i2c: dev: check return value when calling dev_set

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Message-Id: <20250402032529.642172-1-Feng.Liu3@windriver.com>
Date: Wed,  2 Apr 2025 11:25:29 +0800
From: Feng Liu <Feng.Liu3@...driver.com>
To: wsa@...nel.org, haokexin@...il.com
Cc: linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5.10.y] i2c: dev: check return value when calling dev_set_name()

From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

[ Upstream commit 993eb48fa199b5f476df8204e652eff63dd19361 ]

If dev_set_name() fails, the dev_name() is null, check the return
value of dev_set_name() to avoid the null-ptr-deref.

Fixes: 1413ef638aba ("i2c: dev: Fix the race between the release of i2c_dev and cdev")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Wolfram Sang <wsa@...nel.org>
Signed-off-by: Feng Liu <Feng.Liu3@...driver.com>
Signed-off-by: He Zhe <Zhe.He@...driver.com>

---
Verified the build test.
---
 drivers/i2c/i2c-dev.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index dafad891998e..f0bd4ae19df6 100644
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -669,17 +669,22 @@ static int i2cdev_attach_adapter(struct device *dev, void *dummy)
 	i2c_dev->dev.class = i2c_dev_class;
 	i2c_dev->dev.parent = &adap->dev;
 	i2c_dev->dev.release = i2cdev_dev_release;
-	dev_set_name(&i2c_dev->dev, "i2c-%d", adap->nr);
+
+	res = dev_set_name(&i2c_dev->dev, "i2c-%d", adap->nr);
+	if (res)
+		goto err_put_i2c_dev;
 
 	res = cdev_device_add(&i2c_dev->cdev, &i2c_dev->dev);
-	if (res) {
-		put_i2c_dev(i2c_dev, false);
-		return res;
-	}
+	if (res)
+		goto err_put_i2c_dev;
 
 	pr_debug("i2c-dev: adapter [%s] registered as minor %d\n",
 		 adap->name, adap->nr);
 	return 0;
+
+err_put_i2c_dev:
+	put_i2c_dev(i2c_dev, false);
+	return res;
 }
 
 static int i2cdev_detach_adapter(struct device *dev, void *dummy)
-- 
2.34.1