linux-kernel - [PATCH 5.13 186/223] driver core: auxiliary bus: Fix memory leak when driver

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Message-Id: <20210726153852.280096999@linuxfoundation.org>
Date:   Mon, 26 Jul 2021 17:39:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Williams <dan.j.williams@...el.com>,
        Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>
Subject: [PATCH 5.13 186/223] driver core: auxiliary bus: Fix memory leak when driver_register() fail

From: Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>

commit 4afa0c22eed33cfe0c590742387f0d16f32412f3 upstream.

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")
Reviewed-by: Dan Williams <dan.j.williams@...el.com>
Cc: stable <stable@...r.kernel.org>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>
Link: https://lore.kernel.org/r/20210713093438.3173-1-peter.ujfalusi@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/base/auxiliary.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- 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 a
 	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);