linux-kernel - [PATCH] driver core: auxiliary bus: Fix memory leak when driver

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Date:   Tue, 13 Jul 2021 12:34:38 +0300
From:   Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>
To:     gregkh@...uxfoundation.org, rafael@...nel.org,
        david.m.ertman@...el.com
Cc:     dan.j.williams@...el.com, ranjani.sridharan@...ux.intel.com,
        linux-kernel@...r.kernel.org, peter.ujfalusi@...ux.intel.com
Subject: [PATCH] driver core: auxiliary bus: Fix memory leak when driver_register() fail

If driver_register() returns with error we need to free the memory
allocated for auxdrv->driver.name before returning from
__auxiliary_driver_register()

Fixes: 7de3697e9cbd4 ("Add auxiliary bus support")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>
---
 drivers/base/auxiliary.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/base/auxiliary.c b/drivers/base/auxiliary.c
index adc199dfba3c..6a30264ab2ba 100644
--- a/drivers/base/auxiliary.c
+++ b/drivers/base/auxiliary.c
@@ -231,6 +231,8 @@ EXPORT_SYMBOL_GPL(auxiliary_find_device);
 int __auxiliary_driver_register(struct auxiliary_driver *auxdrv,
 				struct module *owner, const char *modname)
 {
+	int ret;
+
 	if (WARN_ON(!auxdrv->probe) || WARN_ON(!auxdrv->id_table))
 		return -EINVAL;
 
@@ -246,7 +248,11 @@ int __auxiliary_driver_register(struct auxiliary_driver *auxdrv,
 	auxdrv->driver.bus = &auxiliary_bus_type;
 	auxdrv->driver.mod_name = modname;
 
-	return driver_register(&auxdrv->driver);
+	ret = driver_register(&auxdrv->driver);
+	if (ret)
+		kfree(auxdrv->driver.name);
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(__auxiliary_driver_register);
 
-- 
2.32.0