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")
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20210713093438.3173-1-peter.ujfalusi@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/base/auxiliary.c b/drivers/base/auxiliary.c
index adc199d..6a30264 100644 (file)
--- 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);