linux-kernel - [PATCH v1 1/1] driver core: return an error when dev_set

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Date:   Mon, 28 Aug 2023 17:58:24 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Saravana Kannan <saravanak@...gle.com>,
        linux-kernel@...r.kernel.org
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>, hdanton@...a.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        syzbot+bdfb03b1ec8b342c12cb@...kaller.appspotmail.com
Subject: [PATCH v1 1/1] driver core: return an error when dev_set_name() hasn't happened

The commit d21fdd07cea4 ("driver core: Return proper error code when
dev_set_name() fails") rewrote the logic of handling the dev_set_name()
error codes, but missed the point that initially set error value to
-EINVAL might be rewritten and hence the error path can't be triggered
at some circumstances. To fix this, make sure that error variable is
set to -EINVAL when other conditionals are false.

Reported-by: syzbot+bdfb03b1ec8b342c12cb@...kaller.appspotmail.com
Fixes: d21fdd07cea4 ("driver core: Return proper error code when dev_set_name() fails")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/base/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 0d246c060f86..67ba592afc77 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -3538,6 +3538,8 @@ int device_add(struct device *dev)
 	/* subsystems can specify simple device enumeration */
 	else if (dev->bus && dev->bus->dev_name)
 		error = dev_set_name(dev, "%s%u", dev->bus->dev_name, dev->id);
+	else
+		error = -EINVAL;
 	if (error)
 		goto name_error;
 
-- 
2.40.0.1.gaa8946217a0b